Clarification of negatives

retouche des négatifs argentiques (éclaircissement)

PURPOSE (concern argentic negatives) : to clear up the blacks of the movie to give of the detail in the clear parts of the image during the edition (use of the mixture ferricianure / hyposulfite / water in basin or at the brush):

Whether it is for the ferricianure of potassium or hyposulphite of soda, to mix a waiting preparation : 1/3 of chemical and the rest of tepid water to facilitate the dilution.

Solution concentrated usually used to clear up the photographic negatives : prepare a compound mixture of: 1 part of waiting preparation of ferricianure + 1 part of waiting preparation of hyposulphite of soda + 5 or 6 times this volume in water.

retouche des négatifs argentiques (éclaircissement)Use
: the film being beforehand wet with some water, he can be treated in basin, in a very brief way. For the retouch in the brush, place the film, emulsion towards one, about the oblique light table. Beforehand, make a try on the unused edge of the negative and extend possibly of water the preparation, according to the wished effect. Pass with a small brush, quickly (because the effect is very fast) and wipe immediately with a small wet sponge. Put back the film in the fixative spray to stop the action of the product.