LPKF ProtoMat 93s Manual
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7.9.2 Coloring milled films
For milled negative films, there is Duroscal Einfärber schwarz, with which positives
can be made. The fully milled gravure film is colored with Duroscal Einfärber by
pouring the liquid onto a SAFIR pad and spreading it evenly over the whole film.
Excess color must be wiped off with cellulose wadding. The stained film must be
held against the light to check it and to find poorly covered areas so that they can
be re-colored. Then immediately remove the coating. The color must not dry.
Attention! Follow the instructions on the color container! Important: the
liquid must not get onto the back of the film as it cannot then be removed
from it. The color is also difficult to remove from other surfaces (fabrics,
skin) (wear apron and rubber gloves)!
7.9.3 Coating removal
Follow the safety instructions on the quick-acting coating remover
container!
When removing coatings, only treat one film per container to prevent any damage
of the second film by contact between the back of it and a surface wet with color.
There are two options when it comes to coating removal:
1. Quick coating removal. Pour the quick-acting coating remover onto the film and
immediately wipe the dissolved protective coating with cellulose applying slight
pressure. Then dry the film with cellulose wadding, blotting paper or a cloth.
2. Removal with water. For this method, the film must be placed in a bowl of
hand-hot water (to which a small amount of washing-up liquid has been
added). The protective layer dissolves after about 30 minutes. Any coating
remains must be removed with a fine hand brush. This method is cheaper and
more environmentally friendly. The film can be left in the water bath as long as
you want.
