Auro product questions

Frequently asked product questions


A huge number of these colour shades can be reached; we offer the mixing of special colour shades as an extra service (for a small surcharge). However, some colours, such as signal yellow or loud red, cannot be reached without synthetic ingredients.

Following our philosophy, we only offer colour shades that can be prepared with mineral or plant based pigments.

Even paints made of natural ingredients are not fully odourless. For instance, essential oils, which are added as solvent or protection against skin formation, have an intense smell. Many customers adore this distinctive fresh fragrance; others are more sensitive to it. For that reason, even while painting with natural products, sufficient air ventilation must be assured during and after application!

Tip: If you want paints with mild odour, go for the AURO-Aqua product range. These products are 100% solvent free.

The majority of AURO products is based on plants and minerals. Some products contain animal-derived ingredients. Those include beeswax, casein, lactic acid, shellac and cochenille.

All vegan products are marked with the “vegan” icon on our website in the product information section so you can easily identify them.

Unlike the “Blue Angel“ or other water thinnable products, AURO Aqua paints contain a binder based on natural resins and oils (instead of synthetic binders), no solvents, no preservatives, and no glycols.

AURO is the only producer of solvent-free, water-dilutable products that are free from synthetics and preservatives.

The danger symbol is meant as a warning notice and is explained in detail on the label, respectively in the Safety Data Sheet. "Dangerous for the environment“ in this case means "toxic for aquatic organisms“. In plain terms this means that the product should by no means get into any bodies of water or into the sewage because it is toxic to organisms living in water, e.g. fishes or algae. This is also explained in the Safety Data Sheet (SDS) under "Section 2: Hazards Identification“. On the label, this information is to be found under "Danger“ or "Attention“.

The same is true for all other danger symbols. They always have to be seen in combination with the corresponding R(isk) and S(afety) sentences, respectively with the now valid H(azard) and P(recautionary) statements.

The SDS informs which materials lead to the marking once a certain, determined concentration limit is exceeded. The dangerous materials are listed under "Section 3: Composition/Information on Ingredients“.

The single dangerous substances and their boundary values for a potential marking are subject to national, European ans international legislation on chemicals, as for instance REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals).

Additionally, there are the instructions for the transport of chemicals. Since June 1, 2015, these are regulated uniformly and worldwide on the basis of the GHS (Globally Harmonized System of Classification, Labelling and Packaging of Chemicals).

The tests according to EN 71 pt. 3 and DIN 53160 (toy norm) are carried out by analysis of the heavy metals contained in a product (EN 71 pt.3) and by tests on the resistance to sweat and saliva (DIN 53160). These examinations are completely independent from the classifications according to the legislation on chemicals or GHS.

All AURO products are produced in our own plant with the highest ecological consistency: the ingredients mostly come from plants or minerals. The complete lack of petrochemical solvents is another part of the philosophy. This highest ecological standard is assured by the permanent monitoring of the raw materials and the continuous quality control.

AURO paints are “state of the art”. Regarding the handling and the durability, they are as good as most synthetic paints. Numerous certificates issued by independent institutes deliver evidence of the high technical quality.

For instance, Stiftung Warentest, a German consumer organisation and foundation involved in investigating and comparing goods and services in an unbiased way, announced AURO Woodstain No. 160 the test winner (05/2006, Test Woodstains). This certifies that the quality of our wood stain is even higher than that of well-known, conventional producers.

Considering the price per square metre of the painted surface, AURO paints are not more expensive than conventional products of comparable quality, sometimes even cheaper. However, valuable natural raw materials (instead of cheap petrochemical ones) and smaller production quantities have their price.

Tip: When comparing prices, do not only consider the price per litre, but always the coverage of the product.


The number of allergies grows continuously. There are hardly any substances that cannot cause allergic reactions to people. For the sake of our customers, we assure you the highest transparency. All substances used in our products are explicitly declared on our website, on the labels and in the Technical Data Sheets. The detailed list of ingredients on the product label gives you complete information whether this product is suitable for you. The current full declaration is available online in the product information section, below the description of the product. For example, here for the AURO Wall paint No. 321.
The growing number of allergies shows: There are hardly any substances that humans cannot be allergic to. For that reason, we regard describing products as „hypo-allergenic“ as misleading.
AURO High-grade lime paint No. 344 is the best choice for you. It contains no essential oils. As an allergic person you can obtain all information about our ingredients by reading the full declaration available for every product

Storage of products

Water thinnable products could freeze, which generally destroys the emulsion. Unfortunately, such products cannot be used any more. Check if it’s still fine: Is the normal processing of the paint during the application possible and the paint dries within the normal time, nothing happened.
Generally, AURO products have an “almost unlimited” shelf life, provided they have been stored in a cool, dry and frost-free place. According to our long experience, almost all customers were able to apply our products without any difficulties, even after they had been stored for a very long time. There is no legal obligation to indicate the shelf life on paints and stains. Due to the contractual agreement with our insurer, on the labels we indicate the storage stability, but it has nothing to do with the real usability of the products. The given storage stability is valid from the date of purchase.

Raw materials

For the sake of our customers, since many years AURO pays attention to the transparency and declares all used substances in the full product declaration on the website, on the labels and in the technical data sheets. Our Raw Materials Guide will give you more information on what is exactly hiding behind the names and where those raw materials come from
Titanium dioxide is a non-poisonous, non-dangerous white pigment that has been produced for over 100 years. Due to its excellent technical and covering properties, it is used in the production of paints. Titanium dioxide is obtained from natural minerals (e.g. rutile) through the separation of coloured associated materials. Besides its use in paints, it is also an ingredient of many every-day products, such as cosmetics or tooth paste. We also apply titanium dioxide as a pigment with a catalytic effect, having a special, fine molecular structure and large surface, in order to neutralize the air pollutants indoors.
Regarding the functionality, the coverage and the light resistance as well as the technical properties, there is currently no real alternative to the non-poisonous and safe titanium dioxide. It is a recognised white pigment, not only in the paint industry, and is used in the production of various products worldwide. If you wish to paint your walls without using titanium dioxide AURO can still offer you a high quality alternative. In that case we recommend using AURO Chalk paint No. 326 – produced with pure lime (calcium hydroxide).
Thiazoles are organic compounds containing sulfur and nitrogen. They are used for the preservation of products, e.g. cleaning agents, paints, cosmetics. When choosing ecological raw materials, AURO always makes the least possible compromise. In this way we have managed to skip preservatives for 92% of our product range. Unfortunately, for a few products using preservatives is inevitable. The valid EU regulations on biocides restrains the usage of natural preservatives, even though they have a history of several hundred years. Thiazoles are the only synthetic material used by AURO. The amount is minimal: depending on the product, the concentration ranges from 0,01 to 0,02%. Even these products comply with AURO’s philosophy because they are still the most ecological solutions of their kind. Nonetheless, our R&D department works on an improvement of their composition with high priority. Generally, it needs to be mentioned that the currently valid and the expected future regulations (EU, biocide regulation etc.) will without doubt have an increasing impact on the the choice of raw materials.


Without sufficient air, drying oils in used cloths could ignite spontaneously and go on fire. Thus, the cloths must be spread out and left for drying in the air each time after finished work. Fully dried cloths can be disposed of with the household waste.
As one of the first producers, AURO implemented the amended requirements of the EU’s EN 71-3 standard for the toy safety by producing all its paints without cobalt. In this way we have achieved a leap in quality and developed a remedy against the long criticised cobalt, a drying agent that had been regarded as irreplaceable till then. Having replaced cobalt with a newly developed solution we offer a new generation of future-proof toy coatings that fulfill both the EN 71-3 standard and the DIN 53160 – perspiration and saliva proof. Click here for more information.
We do not use nanotechnology for our products as it gives us cause for concern. Read the technical paper by AURO company founder, Dr. Hermann Fischer, giving you more clarity on this topic.
AURO’s wood coatings contain no blue stain protection. The EU’s regulations only allow a few fungicides to be admitted as blue stain protection. Those fungicides however are reckoned to be poisonous or harmful to health. Those substances do not comply with AURO’s strict requirements on raw materials. Their usage gives cause for concern from the ecological and the toxicological point of view. Additionally, the structural need of blue stain protection in construction work is generally questionable and subject to dispute in the industry.
AURO’s products are based on plant-derived and mineral raw materials and represent a high ecological and technical quality. Used according to our instructions, they are non-toxic during the application. However, these are technical products that e.g. are not suitable for consumption or other not recommended type of usage. For that reason, as in case of all technical products, reasonable care must be assured and, if necessary, personal protection measures taken. Additionally, in the product descriptions on our website you will find many certificates, human-toxicological assessments (e.g.VOC-content) and technical documents.
As a rule, the pH-value of AURO products is close to neutral. If, caused by their composition, some products have a very high or law pH-value (e.g. wood lyes or lime products), we clearly indicate it according to the valid regulations. You will find this information on the labels and in the technical data sheets. This is also where you can read about the recommended security and protection measures for the application.
Biocides requiring registration are used in our anti-mould products: Mould eliminator No. 412, Mould stop No. 413, and the Anti-mould paint No. 327. All three products are registered for use in the EU as containing biocides with the German Federal Institute for Occupational Safety and Health (BAuA). The documents on the biocide registration are available online beneath the product information under “Certificates” (click on the link on the product name above).

Application of anti-mould products

If you have mould stains whose source has already been found and removed, a sole application of the Mould eliminator is sufficient. If you wish a double protection, you can still use the Mould stop spray for extra safety. If the cause of the mould has not been found and removed, any kind of anti-mould product will only help temporary. In this case we recommend consulting an expert.
All dried AURO products can be disposed of with the household waste. Before disposal, leave the bottle open until all volatile ingredients have evaporated (the vapor is not poisonous). Completely emptied bottles can be recycled.

Application Catechu and Dragon blood stain

These two penetrating stains change the wood’s colour by applying dissolved pigments on its surface. These pigments infiltrate (penetrate) into the wood and change its appearance in a more or less visible way, depending on the type of wood. If the pigment penetrates the soft elements of the wood, it is called a positive stain (Catechu stain). If it penetrates the hard elements, we talk about a negative stain (Dragon blood stain). In the first case the original wood grain remains unchanged; with a negative stain the grain picture is reverse. Another classification is made regarding the solvents: there are water-dilutable and alcohol-dilutable wood stains. AURO’s Dragon blood stain is dilutable in alcohol, the Catechu stain in water. The wood should ideally be raw, untreated and free of metallic items such as nails or screws. Old coatings must be removed.
Both hard- and soft-wood can be treated; the best results are reached on softwood.
Pour the stain out of the bottle into a suitable container. Dip a brush or a sponge into the stain and apply it onto the wood. For an easier handling during application, wet the wood with a sponge soaked in warm water and leave it for drying before painting. If required, a fine grinding with a sanding paper might be recommended between the watering and the painting, in order to smooth the wood fibers that might have been raised during the watering.
Generally it is possible, but time and money consuming, because the floor surface still needs to be coated with a protecting layer after using the penetrating stains.
It is absolutely necessary to protect surfaces treated with a penetrating stain from damage by application of an additional protection coat. Depending on the chosen product, the surface color will change again (the wood grain picture will be more intense). The AURO Catechu stain can afterwards be treated with oils, waxes or paints; wood painted with the AURO Dragon stain should be protected with a transparent paint. The penetrating stain infiltrates into the substrate and forms no layer on the surface that could peel off; small damages can be repainted.

Application wood paints and stains

Our recommendation is the Aqua Woodstain No. 160. It is solvent-free and fulfills the EU’s standards for children toys. The Stiftung Warentest, a German consumer organisation and foundation involved in investigating and comparing goods and services in an unbiased way, announced the AURO Woodstain No. 160 "test winner" (05/2006, Test Woodstains). The stain is available in various nice colours and is easy to be overcoated again when sand, humidity and mechanical wear destroy the coating.
It depends on the outdoor temperature – it needs to be at least 10 °C. If you apply the Swedish red paint below this temperature level, the drying time will be considerably longer. Should there be frost and the wet paint has frozen, it can possibly peel off. Tip: If there is a risk of frost, protect your fresh painted façade with a cover.

Application oils and waxes

The excess material is the oil (or impregnation) that has not soaked into the wood after application. This excessive material must be removed by means of a non-fluffy cloth or paper towel within 15 minutes. Even though this important information is included on the label, it is one of the most frequent application mistakes.
Our recommendation is Clinker oil No. 114. It is suitable for clinker, stone and Cotto-tiles, but also for cement tiles.

Application cleaning products

For maintenance cleaning we recommend our universal Floor cleaner No. 427. Additionally, from time to time your parquet should be treated with our Wooden floors cleaning and care No. 661 for extra care. This product has a slightly waxing and antistatic effect.
Due to its ability to remove fat and the good cleaning power, our Dishwashing liquid No. 473 is greatly suitable for the cleaning of window glass.

Application wall paints and plasters

The Wall paint, white no. 320 is the most economic product with a technically basic quality. The standard quality product Wall paint no. 321 is our most-sold dispersion paint. The top-of-the-line product in this group is the Plantodecor Premium wall paint no. 524 that gets the best marks if it comes to hiding power, degree of white or washability. The wall paints no. 320, 321 and 524 can be mixed with the Full-shade tinting colours no. 330 in every proportion. The quality of the High-grade Silicate paint no. 303 is comparable to that of the Plantodecor paint. Moreover it is free from preservatives because of the combination with silicate. The Silicate paint can also be tinted with the Full-shade tinting colours no. 330 but only up to 10 %. Thanks to the Replebin® technology, all dispersion wall paints have low emissions according to the AgBB evaluation scheme and are suited for use on almost all interior walls and ceilings.
Chalk paint no. 326 contains no titanium dioxide white pigment and therefore has a glazing effect, i.e. it is not covering in wet state. Only after drying, the paint achieves its full hiding power. The High-grade Lime paint no. 344 covers well already in wet state. It is our best-selling lime paint. The Anti-mould paint no. 327 is a special lime-based paint preventing mould infestations. It is authorised according to the EU biocide regulation. Airfresh wallpaint no. 328 is a photocatlytically active lime paint that absorbs and even eliminates unpleasant odours from the room air. All lime-based paints can be tinted with the Lime-tinting base no. 350. Their common features are a high alkalinity, the ability to absorb smells and to avoid mould formation.
In general, it is recommended to stay within the system, i.e. to overcoat lime paint with lime paint and dispersion with dispersion. Because of their high alkalinity, lime paints can only to a limited extent and after preliminary tests be used to overcoat existing dispersion paint coats. Otherwise unwanted interactions of the lime paint with the old dispersion can happen. Old, intact mineral paint coats can be overcoated with both dispersion or lime paint.
Which primer is suited for which substrate? We recommend to use Plaster primer no. 301 for strongly or irregularly absorptive substrates that are to be painted with a dispersions or a lime paint. The Grip coat, fine no. 505 is suited for weakly absorptive and irregular substrates that are to be painted with dispersion paint afterwards. The Grip coat, granulated no. 506 is suited for weakly absorptive and irregular substrates that are to be designed with roll- and brush renderings or fibre plaster or painted with lime paint afterwards.
We recommend using the Wall paint No. 321 white or tinted with the Full-shade tinting color No. 330. You can also use the High-grade lime paint No. 344, white or tinted with the Lime tinting base No. 350.