[Alt-photo] Re: DAS

[Greg Mikol]

I've used a little bit of DAS a couple of years ago. I'm not sure thick 
tissues is the right choice with this sensitizer. It is an azide 
compound (technically, diazido), which are made up of nitrogen. Upon 
exposure to UV, the azide groups break down, releasing nitrogen gas. I 
didn't do extensive testing, but felt like there was a limit to how 
thick you could pour, at a maximum of perhaps 0.5 ml/in^2 (sorry for the 
mixed units) for a 10-12% gelatin solution.

Kees...what is the wet thickness of your tissues?

Now that I've received my DAS from the APUG group buy, I hope to revisit 
this some more.

--Greg


Loris Medici wrote:
> Wow, great info. Thanks very much! Doesn't sound too difficult; are
> those clearing solutions harmless in terms of longevity in some way?
>
> BTW, what can you say about 6% sensitizer per gram of gelatin? My aim
> is to pour a thick but lightly pigmented tissue for high relief...
>
> Regards,
> Loris.