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The World's Largest Collection of Windows Software - Disc 1.iso
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cleani.txt
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1993-08-03
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Cleaning Photographic Trays and Other Chemical Vessels:
=======================================================
by Jerry Finzi
Bottles and trays used in photographic processing and
developing are usually just rinsed with water, but when they are
stained they can be brought back to "almost new" condition by using a
strong solution of hydrochloric acid. The mix should be 1 part
hydrochloric acid to 3-4 parts of water. This solution removes the lime
deposited from hard water. It is this deposit of hard water that holds
all of the chemical dicoloration, so when it is removed, the other
impurities will be washed away along with it.
Caution! With the previous solution, be careful not to get any on the
fingers or hands, and rinse your trays to ensure that all of the acid
is removed.
Developer and fixer vessels often aquire a blackish stain of
metallic silver which can be removed with nitric acid. Developer
stains can also be removed by a solution of potassium permanganate or
bichromate and sulphuric acid (the same as used in reversal
processing). The brown stain would then be removed with a 5-10%
solution of potassium metabisulphite.
Most stains can be removed by the previous methods but if there
are deep stains that have penetrated on porcelain trays, it could very
well be that the porcelain finish was faulty to begin with. The best
remedy in these cases is to replace the trays with better quality
porcelain.
If you have stainless steel tanks or trays, don't think that they
are truely "stainless" when using photographic chemicals. Rust, grime,
and hypo deposits will build up on stainless steel if constant rinsing
and cleaning is not done often. Using a stainless steel cleanser like
Bon Ami or another cleanser made specifically for stainless will bring
back the shine of this metal. Cleasners like Ajax should not beused on
stainless steel as they are too abrasive.
Bottles are so cheap nowadays (plastic or glass) that it would
make sense to simply replace the old ones when stains get out of hand.
To prevent difficult staining on any type of bottle, tank or
tray, get into the habit of rinsing each vessel completely after use
and drying them. This will prevent any difficult stains from building
up. Remember to use warm or hot water when cleaning the newer
"accordian" type of plastic containers (like Falcon) as this will
dissolve any chemicals that are stuck in the pleats of the bottle
sides. Just be careful NOT to inhale any vapors caused by the hot
water and chemicals.
========================================================================
(c) Copyright, 1989, Jerry Finzi
All right reserved
Finzi Studio
36 west 20th Street
NYC, NY 10011
212-255-2110