With the acid stain concretefloors is possible to obtain visual effects that resemble the various marble and natural stones. They are modern floors, the ideal for show-rooms, shops, exposure, professional offices and more. Technically, is a compound formed by metallic salts and plugged acids of various nature, it is applied on concrete bases, Micro topping, self-levelling materials etc. and it develops with these a chemical reaction which produces coloured salt crystals which fills the micro holes in the concrete base colouring permanently the surface. They are offered in 10 standard colours and it is possible to create a big number of colour tones. The acids can develop different colours if used on different concretes therefore it is advisable to carry out a colour test before carrying out the work.