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Is HE-1 Safe to Use?
HE-1, hypo eliminator, is suggested when cloth contaminated
with fixer needs cleaning. Dilution of the usual full strength is mentioned but not by what amount. The hydrophobic separators used for the still water diffusion wash I employ are kept in a weak solution of bleach. They are rinsed prior to use. Not so with the hydrophobic separators I use with my blotter stack dryer. They are to be cleaned in a dilute HE-1. I know the solution must be in an open container. Do I need to wear gloves? Can it be dumped down the drain? Dan |
#3
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Is HE-1 Safe to Use?
Claudio Bonavolta wrote:
They are to be cleaned in a dilute HE-1. I know the solution must be in an open container. Do I need to wear gloves? Can it be dumped down the drain? Dan HE-1 contains ammonia and hydrogen peroxyde., Best regards, Claudio Bonavolta http://www.bonavolta.ch Bleach is also suggested for cleaning screens and fabrics. I think it must be less effective than HE-1. The ammonia present in HE-1 will complex with any traces of oxidized silver. A chlorine bleach might even hinder the removal of silver. The emphasis is on the thiosulfate's conversion to sulfate. What about the silver? Dan |
#4
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Is HE-1 Safe to Use?
wrote in message oups.com... Claudio Bonavolta wrote: They are to be cleaned in a dilute HE-1. I know the solution must be in an open container. Do I need to wear gloves? Can it be dumped down the drain? Dan HE-1 contains ammonia and hydrogen peroxyde., Best regards, Claudio Bonavolta http://www.bonavolta.ch Bleach is also suggested for cleaning screens and fabrics. I think it must be less effective than HE-1. The ammonia present in HE-1 will complex with any traces of oxidized silver. A chlorine bleach might even hinder the removal of silver. The emphasis is on the thiosulfate's conversion to sulfate. What about the silver? Dan HE-1 will not complex some thiosulfate-silver complexes without adding some bromide. For prints (I know you are asking about clothes) its suggested that the print be treated first with Kodak Hypo Clearing Agent, washed for 10 or 20 minutes, then treated in HE-1 with bromide and finally washed enough to wash out the HE-1. HE-1 is a pretty strong oxidizer but probably no worse than laundry bleach. If you are concerned with metallic silver I suppose you could treat the cloth with Farmer's reducer and then HE-1. Of course, bichromate tray cleaner is an even better silver remover. I suppose one could use it, followed with a sulfite or bisulfite clearing bath, but I am not so sure how well the cloth would tollerate it. -- --- Richard Knoppow Los Angeles, CA, USA |
#5
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Is HE-1 Safe to Use?
"Richard Knoppow" wrote in message nk.net... wrote in message oups.com... Claudio Bonavolta wrote: They are to be cleaned in a dilute HE-1. I know the solution must be in an open container. Do I need to wear gloves? Can it be dumped down the drain? Dan HE-1 contains ammonia and hydrogen peroxyde., Best regards, Claudio Bonavolta http://www.bonavolta.ch Bleach is also suggested for cleaning screens and fabrics. I think it must be less effective than HE-1. The ammonia present in HE-1 will complex with any traces of oxidized silver. A chlorine bleach might even hinder the removal of silver. The emphasis is on the thiosulfate's conversion to sulfate. What about the silver? Dan HE-1 will not complex some thiosulfate-silver complexes without adding some bromide. For prints (I know you are asking about clothes) its suggested that the print be treated first with Kodak Hypo Clearing Agent, washed for 10 or 20 minutes, then treated in HE-1 with bromide and finally washed enough to wash out the HE-1. HE-1 is a pretty strong oxidizer but probably no worse than laundry bleach. If you are concerned with metallic silver I suppose you could treat the cloth with Farmer's reducer and then HE-1. Of course, bichromate tray cleaner is an even better silver remover. I suppose one could use it, followed with a sulfite or bisulfite clearing bath, but I am not so sure how well the cloth would tollerate it. -- --- Richard Knoppow Los Angeles, CA, USA Kodak Hand Stain Remover S-5 Solution No.1 Potassium permanganate 7.5 grams Water 1.0 liter Solution No.2 Sodium bisulfite 480.0 grams Water 1.0 liter Treat hands with solution No.1, then rinse and treat with No.2. Kodak also has a couple of Potassium permanganate silver bleaches. Kodak Tray Cleaner TC-2 (not for hands) Solution A Water 1.0 liter Potassium permanganate 5.0 grams Sulfuric Acid, concentrated 10.0 ml Solution B Water 1.0 liter Sodium Bisulfite 10.0 grams To use pour a small amount of Solution A into the tray and swirl around for a few minutes. Then pour out and rinse with water. Then apply Solution B and finally rinse thoroughly. For cleaning rotary dryer canvas and similar I think plain household laundry bleach will work well enough. -- --- Richard Knoppow Los Angeles, CA, USA |
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