Le procede a l'aniline
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Invented in 1864 by William Willis (1843-1923) with a secret formula.
In 1866 H Vogel give a "Willis like" formula:
to sensibilize paper:
water 10 cc
potassium dichromate 1 g
phosphoric acid 10 cc
UV printing, yellow picture on green.
expo is good when shadows details appears yellow.
developpement (very strange)
paper in a tray.
On the tray a wood cover with a blotting paper with a benzol solution of
aniline (red) pin inside.
with short time the picture is blue,
with longer dev, image is black-brown,
dev is topped with water bath.
Other methods by Reynolds, Dawson, Tronquoy, Endemann
who know this process ? who practice it ?
Pascal MIELE