Lessons 11-12 have been published

oquagen · Post by **oquagen** » Sat Jun 12, 2004 10:44 am

Dear colleagues, we have published next lessons of our course in "Technology" section:

#11 "Hologram drying"
http://www.holography.ru/les11eng.htm

#12 "Hologram presentation"
http://www.holography.ru/les12eng.htm

oquagen · Post by **oquagen** » Sat Jun 12, 2004 10:54 am

Colin, if you still maintain the links of holographers, I'd like to present a small page with my bio:
http://www.holography.ru/zsmeng.htm

JohnFP · Post by **JohnFP** » Sat Jun 12, 2004 11:24 am

Danny suggested drying Silver Halide Holograms in Alcohol for a brighter hologram. Has anyone tried this yet?

MichaelH · Post by **MichaelH** » Sat Jun 12, 2004 11:32 am

I've done that many times but never noticed any increase in brightness. What usually happens is that seems to actually help hold some moisture in and my hologram spends the next day slowly color shifting from red to the final color (often green).

Dinesh · Post by **Dinesh** » Sat Jun 12, 2004 1:29 pm

It used to be the standard method with agfa and the pyrochrome process. 1 minute in 100% IPA was the drying method I was taught in the 80's. When I switched to Slavich VRP and used the pyro method with alcohol drying, I was getting nothing. Eventually I found a paper by Hans Bjelkhagen that suggested that reversible bleach and alcohol drying would be detrimental to Slavich plates. I switched to a rehalogenating bleach and Photoflo drying and now I get very bright results with Slavich.
Danny may be referring to DCG plates which is usually dried in IPA.

Colin Kaminski · Post by **Colin Kaminski** » Sat Jun 12, 2004 3:26 pm

oquagen wrote:Colin, if you still maintain the links of holographers, I'd like to present a small page with my bio:
http://www.holography.ru/zsmeng.htm

Just edit your profile to include your web page. That is the list of links that is most easily used. Also post your link to the links section.