SLOW OR QUICK DRYING COLORS
Almost every student experiences difficulty, at times, with the uncertainty of colors drying in the way desired. Sometimes they will dry too rapidly and at others not fast enough.
It is well to use diluting medium to keep the colors moist, but use a regular mixing medium with colors. Oil of lavender is not practical as it dries quickly. Mixing oil is too thick.
Slow drying colors are essential in painting broad grounds. Very often time is needed for changes in designs. It is always necessary to have something to moisten the brush with while working—any diluting medium can be used then. Only a very little is necessary and no other oil need be used. For very slow drying add a drop or two of oil of cloves when mixing the colors. Naturally, the colors will remain moist according to the amount used. Should too much be used, the colors will run. Sweet oil is also used, but less should be used than of the oil of cloves or the colors may remain moist for several days.
Turpentine or oil of lavender are the mediums used for quick drying. Colors will dry quickly and thoroughly, if a little turpentine is added and mixed well with the colors that have been previously well mixed. To dry colors or keep them from running, a little steam will be effectual.
Perhaps it will be only necessary to breathe on the surface.
