Developing; the Negative Technique
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6.
Wash i min.
2 min.
7.
Re-expose 2J min.
1-2 min.
8. Second Developer D158 (No. 146) 2-5 min. 1:1, 20°C.
Or No. 140 4 min. 20°C.
Same as first developer, 6 min. lO'C.
9. Wash Rinse Rinse 10. Fix Acid hardening fix Acid hardening fix 11. Wash 15-30 min.
30 min.
248 REVERSAL OF PROCESS MATERIALS BY THE ETCH-BLEACH PROCESS The etch-bleach process of reversal processing provides a simple and rapid method of preparation of reversals for positive working lithographic plates, photo-engraving, etc. I...n this process the silver image formed in the first developer is removed, together with the gelatine, by an etch-bleach bath (formula 148) to leave a positive relief image which can be developed or dyed to a particular colour.
148.— ETCH-BLEACH-BATH (Kodak £8-3) A. V\/ater, 86-9S''F. (30-35°C.) 750 ml.
Cupric chloride 10 grams Citric acid 10 grams Water to 1000 ml.
B. Hydrogen peroxide 10 volume solution.
For use mix equal volumes of solutions A and B.
Notes: Hydrogen peroxide solutions tend to decompose on storage and this may result in incomplete removal of the gelatine although the silver image bleaches.
What to read after Developing; the Negative Technique?
You can find similar books in the "Read Also" column, or choose other free books by Jacobsohn, Kurt, 1906- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
6.
Wash i min.
2 min.
7.
Re-expose 2J min.
1-2 min.
8. Second Developer D158 (No. 146) 2-5 min. 1:1, 20°C.
Or No. 140 4 min. 20°C.
Same as first developer, 6 min. lO'C.
9. Wash Rinse Rinse 10. Fix Acid hardening fix Acid hardening fix 11. Wash 15-30 min.
30 min.
248 REVERSAL OF PROCESS MATERIALS BY THE ETCH-BLEACH PROCESS The etch-bleach process of reversal processing provides a simple and rapid method of preparation of reversals for positive working lithographic plates, photo-engraving, etc. I...n this process the silver image formed in the first developer is removed, together with the gelatine, by an etch-bleach bath (formula 148) to leave a positive relief image which can be developed or dyed to a particular colour.
148.— ETCH-BLEACH-BATH (Kodak £8-3) A. V\/ater, 86-9S''F. (30-35°C.) 750 ml.
Cupric chloride 10 grams Citric acid 10 grams Water to 1000 ml.
B. Hydrogen peroxide 10 volume solution.
For use mix equal volumes of solutions A and B.
Notes: Hydrogen peroxide solutions tend to decompose on storage and this may result in incomplete removal of the gelatine although the silver image bleaches.
What to read after Developing; the Negative Technique?
You can find similar books in the "Read Also" column, or choose other free books by Jacobsohn, Kurt, 1906- to read onlineMoreLess
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