MARKING INK.
Asphaltum, dissolved in turpentine to a thin fluid, will give you an excellent marking ink for all purposes; dries quickly, does not spread, and is nearly indestructible.
FORMULAS FOR MIXING COLORS. (SELECTED.)
It is impossible to give infallible recipes for mixing colors, on account of the difference in the tone and color strength of pigments, both dry and in oil, many samples having as high as fifty per cent. of barytes or other white makewright material, which not only lessens the color strength of the mixture in proportion to their volume, but weakens the color, in a small measure, by their presence as white material. Hence, color formulas are made subject to modification, not only to please the taste of the mixer, but on account of the presence of poor, weak and adulterated pigments.
The writer has selected a few formulas from which the learner may gain some knowledge of colors, which he can improve upon by experiment.
Note.—Part means in bulk, not by weight.
Plumb.—White lead 2 parts; Indian red, 1 part; ultramarine blue, 1 part. If too dark, add more white lead. (Outside.)
Brick.—Yellow ochre, 2 parts; Venetian red, 1 part; white lead, 1 part. If too dark, add more ochre. Don’t depend upon the common ochre of the stores. It has but little tinting power. Use French ochre ground in oil. (Outside.)
Bronze Green.—Chrome green, 5 parts; lampblack, 1 part; burnt umber, 1 part. If too dark, use more green. (Outside.)
Jonquil Yellow.—White lead tinted with chrome yellow and vermilion.