" " Amidoazobenzene.
Very Loose.
Combination of A-Naphthol with Paratoluidine.
" " Metanitroaniline.
" " Nitroparatoluidine.
" B-Naphthol with Aniline.
" " Paratoluidine.
" " Orthoamidoazotoluene.
The samples were tested for fastness to light by exposing them for nine days with the following results:—