[Alt-photo] Re: DAS

[Charles Berger]

UltraStable pigment films were typically 2.5 mill thick.  A 10% gelatin
solution coated with a  #100 - 120 coating rod  gave a wet coating
thickness of @ 250 microns which dried down to @2.5 mils.

How "thick' do you make your films?

Charles


On Wed, Apr 17, 2013 at 8:05 PM, Greg Mikol <greg.mikol at ieee.org> wrote:

>
> 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.
>>
>
>
>
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