FR916394A -
Process for preparing color prints, the color of which is rendered invisible by mixing with an opaque or black coloring material
- Google Patents
Process for preparing color prints, the color of which is rendered invisible by mixing with an opaque or black coloring material
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B44F1/00—Designs or pictures characterised by special or unusual light effects
B44F1/08—Designs or pictures characterised by special or unusual light effects characterised by colour effects
B44F1/10—Changing, amusing, or secret pictures
FR916394D1943-06-011945-10-24
Process for preparing color prints, the color of which is rendered invisible by mixing with an opaque or black coloring material
ExpiredFR916394A
(en)
Process for the manufacture of non-lumpy or practically non-lumpy caramel, coloring matter and the like by heating sugars in the presence of alkaline substances