Amazing what one extra methyl group will do to change chemical properties ; ) Nelson Moyer

In photo printing, the print is exposed, then goes into a developer, then to a fixer (which stops the development process), then a water wash for 4-5 minutes. If one wants the print to have a gloss,

Al Brown wrote: As you can tell from acetone's chemical name: dimethylketone. Tony Thompson tony@...

Ed Mines wrote: Duco cement uses acetone as solvent; it is very fast to evaporate. I've learned to use it in place of Ambroid cement which is no longer available. What kind of crackpot nonsense

Thanks Schuyler, I'll try to find some. I tried the alcohol and peroxide on a que tip and nothing. I'm very disappointed but it is a print and I may try to find a new one. If available and

Hi Fenton. There is a process called “de-acidification.” As many of you know, the “Official Guide” book were printed on flimsy paper which was also acid-rich, and as a consequence become

try this link from the Smithsonian https://siarchives.si.edu/.../collections-care-guidelines-resources/ive-got-mold-my-files I found it by goggling how do I remove mold from old paper

The brown "stain" on a print can also come from inadequate rinsing during processing. The pattern of the area would likely reveal whether it's that or acid from the tube. As far as removing mold from

Fenton Wells asked: "Looks like I was wrong and it is not mildew but an acid from the tube that it was stored in. It's brown. The freezer and drying it didn't budge it. Not sure it's worth going

Looks like I was wrong and it is not mildew but an acid from the tube that it was stored in. It's brown. The freezer and drying it didn't budge it. NOt sure it's worth going too much

I like Jon's idea Real photo paper is pretty water resistant. I would add a tiny drop of ammonia to the Q tip + water to kill the bacteria. but i'd test it

MEK and acetone are chemically very similar (both are ketones), but MEK has a higher boiling point. That gives you more working time: handy in warm weather. Al Brown, Melbourne, Fla.

My last employer sold solvent borne coatings.The most popular solvent was a mixture of toluene and MEK. Toluene (pronounced toolean by navy men) is an industrial narcotic - it gets you high. It is

If it costs too much you might try a Q tip and water or soap and water. -- Jon MillerFor me time stopped in 1941Digitrax Chief/Zephyr systems, SPROG, JMRI UserNMRA Life member

The American Institute for Conservation https://www.culturalheritage.org may be able to help you find a paper conservator in your area. Naturally, there is some cost involved, and you will have to

I’ve made reservations to attend the upcoming Mid-Atlantic RPM (MARPM). Anyone care to split a room? Please use the REPLY to SENDER link at the bottom of the message to contact me off list. Or copy

Hello John and FC Group! The ERIE's 93000 series of nominal 36' inside length XM boxcars are of no relationship to the older 'Fowler' ERIE cars. The former were built in 1920-21 by Standard Steel

Fenton--Also the Branchline Rib/3/4 end can be modified. Sand or file the rib off flush then trim to the correct height. For me, the BL end looks better with its rounded contours. The ribs of the IM

I agree with Bob. That’s a job for professionals, or at least, professional advice. I presume, Fenton, that the photo depicts a steam era freight car, at least? Schuyler

Groups IO won't let me upload this file to the files section so lets try it this way. -- John