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.
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