ld will of course crack it,
and sudden and extreme changes of temperature may have the same
effect. In other words, some care must be used with all pictures as a
matter of course.

COLOR LIST

=Whites.=--_Zinc white_ is the only permanent white, but it lacks body
and is little used. The lead whites, _flake_, _silver_, _cremnitz_,
will darken in time, and will turn yellow with oil, and may change
with or affect change in other pigments. The zinc white is liable to
crack. We have no perfect white, so practically you may consider the
lead whites as permanent enough, as other painters do.

=Yellows.=--_Cadmium_ is permanent in all three of its forms. It is a
color the permanence of which is of great importance; for its
brilliancy is quite essential to modern painting, and if it were not
permanent, the picture would soon lose the very quality for which the
color was used. _The chromes_, which are of similar color-quality, are
less permanent, and are almost sure to turn to a horny sort of yellow;
and a green, which by their use was bright and sparkling, will, in a
few months, lose its freshness--this cadmium will not do. Cadmium is
also to be preferred to chrome, because it is of a much finer
tonality. Greens and yellows made by the admixture of chrome are apt
to be crude as compared with those in which cadmium was used.

_Strontian yellow_ is a permanent and most useful light yellow, much
to be preferred to all other citron yellows except the pale cadmium,
and can be used in place of that if necessary. They are both expensive
colors of about the same cost.

_Naples yellow_ was a very prominent pigment with the older painters.
It is still very much used, but in the simplification of your palette
you may as well leave it out, as you can get the same qualities with
cadmium and white. It is durable and safe, but adds another tube to
your palette which you can well dispense with.

_The ochres_ are among the oldest and safest of pigments. You can use
them with any colors which are themselves permanent. There are several
of them,--_yellow ochre_, _Roman ochre_, _transparent gold ochre_, and
others. They are all native earths, and though they contain iron, they
are sufficiently inert to be thoroughly sound colors.

_The siennas_, burnt and raw, are like the ochres, native earths, very
old and permanent colors, and may be used anywhere.

_The umbers_ are in the same class with the siennas and