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I've added mortensen's wet paper negative mthod
Check it out. It's pretty amazing.
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 Originally Posted by richsul
I believe there is one of Josh's in the Fumed Silica notes at the very end. It is a curve. He uses LAB Color. I may have others he sent via email and I'll look for them. In Lab Color he the best he had gotten was a 17 on normal paper like CO320 or Platine. With silica he was able to get a 25 but backed off to a 22 as he was getting too many brush marks with the overload of silica.
Okay had a look at the notes but cant see any image scans, no problem i know its best to see in person. In relation to dmax, what scale are you refering to 17,22, 25, is that steps? Personally i understand dmax readings as 1.3 1.4 or 1.5, etc.. can you tell me what your numbers equate to in relation to a densitometer reading.
thanks
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Dick,
Could you please give us the exact name and source of the fumed silica you have been using? I AM NOT NIT-PICKING ! there are 1) different size particle, some for stir-in, some should be milled. 2) There are Organo-treated (hydrophobic)fumed silicas! Untreated fumed silica is very hydroscopic. I think that which you are using is very relevant.
Great worck, by the way. I never woulda thought about trating the paper with DRY fumed silica.
Bill
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So would this silica also work when applying emulsions like the Rockland or Rollei Black Magic? Seems intriguing.
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We use the most common hydrophilic version, nothing fancy.
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I am not sure it would work with something emulsified like paint. We've only used it with not emulsified coatings, but then you never know. I tried mixing it in gelatin to coat paper for final support for carbon. Nada. I think in inkjet paper it is press on with rollers.
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Does this style of mask provide adequate protection when using the "smoke in a bag"?
http://www.bigsafety.com.au/prod641.htm
Jon
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