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ok here it is my modifications ferric sulphate 1g potassium persulfate 1g citric acid 50g I substituted it with acetic acid lithium bromide 10g a very slow working bleach :D test is drying but can tell from the test the refraction is much better and cleaner... I can tell this by viewing it as a tra...

dannybee wrote:anyone use Copper Sulfate bleach with color? does it reduce blue haze?

So grain size seems to be the problem? What AgX emulsion do you use?

Without having tried myself, I'd expect that changing from potassium bromide to lithium bromide (or say, sodium bromide) will have little effect on the bleach. What might be interesting with lithium bromide though, is that one could make bleach solutions at lower water concentration. Lithium bromide...

To come back to Joe's initial question about self cleaning a laser beam in air. What about using a thick volume Bragg grating for spatial filtering? Would that be along those lines? http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1342671 mentions a SPIE paper (Spatial filtering f...

Ed Wesly wrote:The original article is posted as a reference at the bottom of: http://edweslystudio.com/Formulae/Developers/TEA.html

Thanks for sharing!

Din wrote:Of course we invented TEA. It is our national drink, after all!

https://www.youtube.com/watch?v=tN9EC3Gy6Nk

La-la-la, magnificent! I finally realize why I always felt attracted to TEA.

No Martin, I think the pre-swelling idea belongs to Jeff and the UK. TEA as a swelling agent was well known (as was multiple exposures), and despite the claim of priority by an individual highly skilled in the art in the late '60s, Jeff was the first to publish about about the combination and in a ...

OK. So unless some Russian holographer comes up (again - why not Denisyuk?), the glory of having introduced the TEA pre-swell goes to the US (http://en.wikipedia.org/wiki/File:The_Star-Spangled_Banner_-_U.S._Army_1st_Armored_Division_Band.ogg) Thanks for sharing these details about the context of th...

Looks like it was the use of TEA as an emulsion shrinkage control mechanism that was known since the '60s. Yes, but I always assumed that was done in a post-swelling mode: adding TEA to a developed/fixed AgX emulsion to compensate for the loss of material. Jeff's using it with multiple exposures is...

I remember Peter Miller was talking about the (then) new method of swelling to get colour (pseudo-colour). A lot of the audience was having trouble with the concept, but Graham pretty much got it right away. I guess that was also because the pseudo-colour method was "British" - introduced...