58 CASEIN. 



9. Red. or 



2 parts milk. 2 parts milk. 



5 ,, water. 5 ,, water. 



25 ,, vermilion. 12 ,, colcothar. 



No particular difficulty attaches to the compounding of 

 pigments for casein-silicate paint, but care should be exercised 

 not to take pigments that harden rapidly. 



CASEIN-SILICATE PAINT RECIPES. 

 1. Blue. 2. Yellow. 



5 parfcs casein-silicate vehicle. 5 parts casein-silicate. 



3 ultramarine. 5 ochre 



3. Black. 4. Green. 



8 parts casein-silicate. 5 parts casein-silicate. 



3 ,, bone or ivory black. 11 ,, chrome green. 



5. Red. 6. Brown. 



5 parts casein-silicate. 5 parts casein-silicate. 



4 ,, colcothar. 4 ,, brown manganese oxide. 



7. White. S. Grey. 



5 parts casein-silicate. 5 parts casein-silicate. 

 5 ,, zinc white. 5 ,, zinc white. 



\ part lampblack. 



Or 



6 parts casein-silicate. 

 5 ,, zinc white. 

 part lampblack. 

 ,, ultramarine. 



TROJEL'S BOILED OIL SUBSTITUTE. 



H. Trojel proposes to make a cheap substitute for boiled 

 oil by carefully mixing together 100 parts of casein, 10 to 25 

 parts of soap solution and 20 to 50 parts of slaked lime, 25 

 to 40 parts of turps being afterwards stirred in by degrees, 

 and the whole thinned down with water to the consistency 

 of boiled oil. If this preparation is to be kept for some time, 

 a little ammonia is added, to keep the casein from settling 

 out. The mass dries very quickly and can be mixed with 

 colour for coating damp brick or wooden walls. It also 



