Examination of the cross-sections has shown that in the earlier phase he used exclusively cobalt blue, available from 1802, his habitual choice during the 1870's and early 1880's, but in finishing and revising the composition he used only artificial ultramarine which came in use in the 1870s.
A common misconception with this is that nits and lice are the same thing. In fact this is not the case, the truth is: Lice are the tiny grey or brown insects that are found in the hair. The lice are about the size of a small seed (i.e. Sesame seed) and cling to the hair staying close to the scalp which they live off.
1 Lice on your scalp, body, clothing, or pubic or other body hair. 2  Adult lice may be about the size of a sesame seed or slightly larger.3  Lice eggs (nits) on hair shafts. 4  Nits resemble tiny pussy willow buds. Adult lice may be about the size of a sesame seed or slightly larger. 2  Lice eggs (nits) on hair shafts. 3  Nits resemble tiny pussy willow buds. 4  Nits can be mistaken for dandruff, but unlike dandruff, they can't be easily brushed out of hair. 5  Small red bumps on the scalp, neck and shoulders.