| Sublimed white lead | 50% |
| Zinc oxide | 35% |
| Silica and barytes | 12% |
| Prussian blue | 3% |
| Ground in linseed oil, turpentine and drier. | |
This panel, after three years’ exposure, is in good condition. Slight checking observed.
Test No. 2. Concrete primed with a 20% solution of (alum) (aluminum sulphate). Second and third coated with No. 119 blue.
In similar condition to Test No. 1.
Test No. 3. Concrete primed with zinc sulphate followed by two coats of para red.
Para Red Formula
| Blanc fixe | 60% |
| Whiting | 25% |
| Zinc oxide | 3% |
| Paranitraniline lake | 12% |
| Ground in linseed oil, turpentine and drier. | |
Panel in fair condition with exception of slight crazing. Characteristic dullness of color after exposure shown. Bright red color restored upon washing.
Test No. 4. Concrete primed with an 8% solution of stearic acid and rosin dissolved in benzine. Second and third coated with No. 119 blue.
This panel is not in as good condition as Tests Nos. 1 and 2, and would indicate the inferiority of the priming liquid used. Color failing in spots and checking observed.