- Joined
- Sep 27, 2008
- Messages
- 25
- Format
- Medium Format
I noticed that some people regularly have trouble with allowing gelatin to stay on the glass during processing.
Here is a trick that will really make gelatin stick to the glass strongly even when using the most alkaline developers. Even unhardened gelatin will stay on the glass easily.
1] Make a stock solution of:
-- 4ml 3-amino-propyltriethoxysilane (CAS#: 919-30-2)
-- 5.5ml of Isopropyl Alcohol
-- 0.5ml De-Ionized Water
-- Allow this solution to sit for 24 hours
2] Clean your glass plates well, first with dishwashing liquid and then with a Ammonia based glass cleaner (called Glassex here in Holland)
3] Take 1ml of the solution made in step 1 and add 20ml of Isopropyl Alcohol to that.
4] With a clean paper towel rub this solution onto your freshly cleaned glass plates. You will see a white haze appear on the surface of the glass.
5] Let the plates sit for a few hours to allow the silane to bond to the glass.
6] Remove the haze from the glass with an ammonia based glass cleaner. (This becomes difficult if you wait more than about four hours)
7] Your plates can now be stored until the time you are ready to coat them.
When using this procedure you will not need to pre-sub the plates with chrome hardened gelatin before coating.
(Please mix your Silane in a well ventilated area because it is not a very pleasant liquid. Wear eye protection and gloves. When using it, I wear a painters mask with a carbon filter.)
Here is a trick that will really make gelatin stick to the glass strongly even when using the most alkaline developers. Even unhardened gelatin will stay on the glass easily.
1] Make a stock solution of:
-- 4ml 3-amino-propyltriethoxysilane (CAS#: 919-30-2)
-- 5.5ml of Isopropyl Alcohol
-- 0.5ml De-Ionized Water
-- Allow this solution to sit for 24 hours
2] Clean your glass plates well, first with dishwashing liquid and then with a Ammonia based glass cleaner (called Glassex here in Holland)
3] Take 1ml of the solution made in step 1 and add 20ml of Isopropyl Alcohol to that.
4] With a clean paper towel rub this solution onto your freshly cleaned glass plates. You will see a white haze appear on the surface of the glass.
5] Let the plates sit for a few hours to allow the silane to bond to the glass.
6] Remove the haze from the glass with an ammonia based glass cleaner. (This becomes difficult if you wait more than about four hours)
7] Your plates can now be stored until the time you are ready to coat them.
When using this procedure you will not need to pre-sub the plates with chrome hardened gelatin before coating.
(Please mix your Silane in a well ventilated area because it is not a very pleasant liquid. Wear eye protection and gloves. When using it, I wear a painters mask with a carbon filter.)