The casein paint is permeable and not washable. Very stable and with good hiding power, it becomes opaque after drying.
It has been used for centuries to embellish and sustainably protect the woodwork, furniture or walls, and applies to all mineral substrates, plasters, plasterboard and old unpainted paints. Be careful not to use it in damp rooms
1) In a small bucket or saucepan, pour 2 liters of water; Whisk together 300 g of casein to dissolve any lumps.
2) Add 80 g of alum salt while stirring vigorously with the spatula. The mixture will thicken and become translucent; put it aside and let it rest 2 hours.
3) Meanwhile, pour 2.50 liters of water into a large bucket with 6 kg of powdered Meudon white and mix with electric stirrer to obtain a thick mixture.
4) After 2 hours, pour the contents of the small bucket into the large one, and mix. Add the previously wet pigments to the water and mix to obtain a homogeneous color. For more sustained colors, reduce the dose of white Meudon. Let stand 1/2 hour. The mixture is ready for use. Apply 1 or 2 layers to the spalter (wide brush) or roller.
Recipe from Antoine Bosse-Platière
Now available: Tutti, ready-to-use casein paint.
Casein is also traditionally used as a fixing aid for lime paints in the proportion of 5 to 10% by weight of lime. It provides better grip. It also allows, mixed with water and pigments (glazes), to fix rather frank colors on a plaster or a lime paint that has already made its decision.
Our casein is obtained from lactic acid. It is food but for reasons of storage, outside food standard, it is unfit for consumption.