04 Demystifying Maroger - Making the Glue Sizing 

Great video. Thank you

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"Hard Water" is the term you are looking for, not impure, dirty water... hard water is water that may have calcium, minerals and other metals suspended within it- such as iron. Then there is the commonly used chlorine, and bromine- this also may effect your mixture. The does not mean it is not potable water, it simply means there are things carried in the water that may affect your mixture chemically. Not everyone has hard water, so this may or may not be a problem for some, and bromine does not evaporate out of the water as does chlorine, so if your city is running it, then you may have a problem there- so it's not a bad precaution to just take just to be sure... Good tip~!

Hello, can I coat with rabbit skin glue and gypsum directly on birch plywood and paint with egg tempera without linen, or cloth, or other else? I am waiting for answering, thank you very much.