[pure-silver] Re: holga focus - and green goo
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 5 Nov 2007 22:08:41 -0800
----- Original Message -----
From: "Bill Stephenson" <photographica@xxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, November 05, 2007 7:54 PM
Subject: [pure-silver] Re: holga focus - and green goo
A few years back (don't know to where it disappeared) I had
a small ultrasonic cleaner designed for the optical trade.
As I recall, it was a catalog special (before the
Internet) and cost about $50. By kicking up the solvent a
notch or two, I was able to clean and degrease a number of
gears, shafts, bearings, etc., as used in the 16mm
projectors I was working on - back in the days when people
actually used projectors and film instead of DVD's and
LCD's. Anyway - it worked great, if you could ignore the
annoying high-pitched "squeal". I usually loaded up the
tank, turned it on, and went to lunch.
Would something like that be good for "green goo"? If so,
would naphtha be the solvent? Acetone is more agressive,
but would evaporate before I got back from lunch.
-Bill
The original solvent was probably 1,1,1,trichlorethane,
now a hard to get environmental no-no. Naptha or very pure
Isopropyl alcohol (99+%) will work. However, the alcohol
will dissolve some plastics so test first. Acetone is a good
degreaser but is pretty non-selective as a solvent and will
dissolve a lot of plastics and paint so is not so good for
general camera cleaning.
The hazard of naptha and alcohol are that they are
inflamable, especially the vapors. In the bad old days
carbon tetrachloride was often used because it is
non-inflamible but its dangerously toxic so should be
avoided.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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