Repeated coatings of liquid silicate of soda will render the substances coated, fireproof. Let the final coat be a thin wash of lime which unites with the silicate of soda, forming silicate of lime, an insoluble substance.

No. 2

Mix 80 pounds of powdered silex, 40 lbs. of China clay and 20 lbs. of air slacked lime, intimately together, with 60 lbs. of liquid silicate of soda. Thin with water to the consistency of paint. Colors can be added, such as the ochres, umbers, earth reds and siennas. Two coats should be given.

No. 3

70 lbs. of zinc white, 40 lbs. of air slacked lime, 50 lbs. of white lead and 10 lbs. of sulphate of zinc.

First mix the zinc and lime with sufficient linseed oil to make a thick paste. Then add 1 gallon of heavy liquid silicate of soda, together with the white lead and sulphate of zinc. Stir well. This is white. Colors can be made as in the previous cases. Thin with water, if too thick.