Volume 1  |  7 Apr. 1876   |  Page 99  TD> |
It may be however that the Bichromate solution only affect the surface of the film, although from the action of the film in absorbing ink in some parts and repelling it in others it would seem as if the Bichromate penetrates the whole substance.
 Volume 1  |  7 Apr. 1876   |  Page 99  TD> |