This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Introduction. The coloring of lantern-slides is not a difficult task, but it is necessary that they be handled with great care, as the film is very delicate and easily spoiled. There are many different makes of colors on the market. The most popular in use are the Japanese Water Colors and Dunne Transparent Pastel Colors. A box containing twelve tubes will be sufficient to color several dozen slides, and can be secured at any art store. Some of the desirable colors for slides are Rose-Madder, Gold, Ruby-Red, Purple, Ivory-Black, Silver-Gray, Flesh, Cobalt-Blue, Lemon-Yellow, Gray-Green, Sepia and Emerald-Green.
1008. The tubes should never be left uncorked. The best brushes are either the Russian or Red Sable oil brushes Nos. 1, 5, 7 and 10. Cut the handles short enough to fit into a large box of colors. Use No. 1 for all detail work, No. 7 for warm colors, No. 5 and No. 10 for dark ones. Never attempt to use flimsy brushes as they cannot carry the color with them fast enough to keep from spotting. Cleanse them well before using the different colors, and before putting them back in the box.
1009. Before beginning the work place three or four thicknesses of newspaper on the table, to test the colors and wipe the brushes on, tearing it off as it becomes soiled. A very convenient accessory to this work is a china pallette having a number of recesses in it. These pallettes are made with 4, 6 and up to 21 recesses. The six recess pallette, however, will answer very well and is not as expensive, of course, as the larger ones. Colors can be left over in these recesses, provided they are protected from the dust. The larger pallettes are quite valuable, as they facilitate the mixing of colors more economically.
1010. If it is not convenient to purchase one of these china pallettes, use a common piece of glass, previously well cleaned. Place the pallette or sheet of glass (about 8 x 10 inches in size) on the newspaper, together with two small cups of clear water, one for diluting the colors (which must be kept clean) and the other for washing the brushes. If the brushes are washed while using them, wipe the water thoroughly out of them each time on the newspaper or the color will be made too weak to use.
1011. When opening the tubes catch the fold at the lower end of tube between the thumb and first finger. Unscrew the top and squeeze the tube lightly, discharging not more than one drop of the color, except when coloring dark shades; then colors must be used stronger. If the top will not unscrew pass a small knife blade around the base of the cap-this will release it. Keep the tubes clean at the top and no difficulty will be experienced on account of the cap sticking.
Mixing Colors. To mix or dilute any color, first discharge a drop of the color on the slab; then charge the brush with clear water, drop it onto the color and mix with this brush. If the color is too strong, dilute by again charging the brush with water-that is, dipping it in the cup of water and dropping onto the color.
1013. Where a combination of colors is to be prepared, discharge one drop of each of the colors on a separate space on the slab: combine the colors in another space by dipping the brush in each color and carrying it to the one space, then diluting the combination of colors with water in the same manner as a single color