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.
Head lice infestation (also known as pediculosis capitis, nits, or cooties) is the infection of the head hair and scalp by the head louse (Pediculus humanus capitis). Itching from lice bites is common. During a person's first infection, the itch may not develop for up to six weeks.ead lice are spread by direct contact with the hair of someone who is infected. The cause of head lice infestations are not related to cleanliness. Other animals, such as cats and dogs, do not play a role in transmission.