DAS Comparison

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DAS comparison Here is a quick comparison of the two types of DAS (4,4 ‘ – diazidostilbene -2,2’ – disulfonic Acid Disodium Salt Tetrahydrate) I have. The first one, which I just purchased, is supposed to be 99.63% pure, whereas the second, which I purchased online, only has a purity of 97%. I’m posting this […]


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Ideally the best place to make carbon prints would be a studio with running hot and cold water, but that isn’t the case for my current studio. I do have plans to move into a better studio, but am waiting for the current tenants to move out. The space right now is being used as a […]


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I was separating three pounds of DAS into smaller containers a couple days ago, working under a red safelight, and got to thinking. I thought a red safelight was the least probable to expose any of the light sensitive salt, but was it really? I got out my UV light meter and read the illuminance […]

Exposure Unit: Part 3- Build

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The heat sinks I purchased needed to be modified for use with the surface mount leds. First I drilled and tapped 3mm holes to screw on the leds. Since copper is a very soft metal, drilling and tapping was difficult as the holes are so small and the drill bits and tapper would catch then […]

Staining Test: Part 2

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The goal of today’s test was to see if ox gall causes staining at higher concentrations. I followed the same procedure as yesterday: made glop with 100ml water, 10g gelatin, 5g sugar, 2ml of diluted lamp black, then split it into five jars with 20ml of glop each. The amount of ox gall added to […]