Neil thanks for the response. I had found the cnreenactors but not George's. Your response to Mark was intriguing. I thought I had read that the developing or fixing was different if you were going to do a positive or a negative. Or did I miss something?
I remembered something I saw in one of Quinn's YouTube Movies. He makes a negative but at the end (1:50) he shows the positive by putting it up to black cloth. So is a glass positive just the negative done on black glass? I suppose the negative could be displayed as a positive by mounting it against a dark background.

Scott


Quote Originally Posted by Neil Miller View Post
Scott - you can also have a look at Robert Szabo's forum (been around a long time) for answers to a lot of questions:

http://www.cwreenactors.com/phorum/

Also, George Berkhofer's manual is precise, plain-speaking and debunks a lot of the myths asociated with the process:

http://www.collodionart.com/

Mark - the reason is that a collodion positive is, in fact, a thin negative. The dark background (or dark glass) makes it appear as a positive - you can sometimes see the same effect with thin film negatives held against a dark background when the light glances across them.

Regards,
Neil