Blind and Shutter Greens or Trimming Greens of the chrome green type are usually mixed from a base containing from 20 to 25 per cent of chemically pure green, balance of pigment consisting of barytes. The shade may be light, medium or dark, the mixed paint made from the light green being heaviest in weight per gallon, that made from the dark shade being lightest, varying between 14 and 15 pounds. Taking a medium chrome green of the type referred to as the base, the formula will be as follows: -
1,000 pounds chrome green medium in oil (20 to 25 per cent color);
pounds raw linseed oil;
pounds emulsion (25 pounds solution, 7 pounds varnish);
Result 100 gallons green that will not run or sag on the surface and hold well in suspension. Will show on chemical analysis approximately 59 per cent. pigment and 41 per cent. pigment, and not over 2 per cent. water in the total paint.
Composite Greens for Exterior House Painting can be made from bronze green, bottle green, olive green and moss green in paste form, or may be based on a mixing of pure color, reduced with an extender in oil, as it is commercially out of the question to use strictly pure oil colors for the exterior painting of a house. Take a bronze green, for instance, of dark shade, a formula like this will make a good wearing paint for trimming, etc.: -
Twelve pounds lemon chrome yellow paste in oil, 10 pounds chemically pure chrome green paste, dark in oil,
12 pounds carbon black paste in oil or lampblack in oil, 30 pounds barytes ground in oil and 34 pounds fine whiting or asbestine in oil (preferably the latter) thinned with 42 pounds raw linseed oil, 8 pounds japan drier and 4 pounds turpentine will produce 13 1/2 gallons of liquid bronze green of good body and spreading power, weighing 11 1/2 pounds per gallon.
For a bottle green for ordinary outside painting, figure on 30 pounds drop black in oil, 10 pounds chemically pure chrome green deep in oil, 3 pounds Chinese or Prussian blue in oil, 4 pounds zinc white in oil, and 53 pounds barytes ground in oil, thinned with 35 pounds raw linseed oil, 7 1/2 pounds japan drier and 3 1/2 pounds turpentine, producing 12 gallons liquid paint, weighing 12 pounds per gallon.
Olive greens for exterior woodwork in liquid form can be produced at comparatively low cost on a formula like the following: -
Seventy pounds French yellow ocher in oil, 12 pounds lampblack in oil, 8 pounds white lead in oil, 8 pounds medium chrome yellow in oil, and 2 pounds Venetian red in oil, thinned to brushing consistency with 60 pounds raw linseed oil, 12 pounds japan drier and 4 pounds turpentine, producing 16 gallons paint weighing 11 pounds per gallon. Moss green is made with 45 pounds French yellow ocher in oil, 20 pounds white lead in oil, 10 pounds chrome green in oil, light shade of the 20 per cent variety, and 25 pounds raw umber in oil, thinned with 35 pounds raw linseed oil, 7 1/2 pounds japan drier and 3 1/2 pounds turpentine, producing 12 1/2 gallons paint, weighing 11 3/4 pounds per gallon.
Solid Yellows are rarely called for and then usually in the medium shade. Unless the specifications call for a chemically pure yellow, the following makes the best wearing paint: -
Sixty pounds medium chrome yellow in oil and 40 pounds floated barytes in oil, thinned with 38 pounds refined linseed oil, 7 1/2 pounds pale drier and 3 1/2 pounds turpentine. This will produce 11 gallons of paint, weighing 13 1/4 pounds per gallon.
Solid Red type of liquid paints comprises mostly Tuscan red, Venetian red and bright reds, mostly used for sash and trimming work. For either the Venetian or Tuscan red in liquid form, thin 100 pounds of the paste in oil, with 38 pounds raw linseed oil, 10 pounds japan drier and 4 pounds turpentine, producing 12 3/4 gallons of a stout liquid paint, weighing 12 pounds to the gallon.
For a brilliant sash red that is often demanded, a paste base in oil, composed of about 15 parts by weight of pure toner of the bluish type and 85 parts of blanc fixe ground in linseed oil, at the rate of 65 per cent pigment and 35 per cent oil is of sufficient hiding power. To 100 pounds of this paste figure on 42 pounds of raw linseed oil and 12 pounds japan drier of good strength, to produce 14 gallons liquid paint, weighing 11 pounds per gallon. An addition of Venetian red paste will give better hiding power, but subdue the brilliancy of the reds.