Colors Given to Portland Cement Mortars Containing Two Parts River Sand to One Part Cement

Dry

Material Used

Weight of Dry Coloring Matter to 100 Lbs. of Cement

Cost of

Coloring

Matter per

Pound

1/2Pound

1 Pound

2 Pounds

4 Pounds

Lampblack

Light Slate

Light Gray

Blue Gray

Dark Blue Slate

15 cents

Prussian Blue

Light Green Slate

Light Blue Slate

Blue Slate

Bright Blue Slate

50

,,

Ultramarine Blue

Light Blue Slate

Blue Slate

Bright Blue Slate

20

,,

Yellow Ocher

Light Green

Light Buff

3

,,

Burnt Umber

Light Pinkish Slate

Pinkish Slate

Dull Lavender Pink

Chocolate

10

,,

Venetian Red

Slate, Pink Tinge

Bright Pinkish Slate

Light Dull Pink

Dull Pink

2 1/2

,,

Red Iron Ore

Pinkish Slate

Dull Pink

Terra-Cotta

Light Brick Red

2 1/2

,,

The above table is taken from Sabin's "Cement and Concrete."

327. Painting Concrete Surface

Special paints are made for painting concrete surfaces. Ordinary paints, as a general rule, are not satisfactory. Before the paint is applied, the surface of the wall should be washed with dilute sulphuric acid, 1 part acid to 100 parts water.