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Athiril

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About Athiril

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  • Favorite Area of Science
    Physics, Chemistry, Optics
  1. I thought I typed up a reply.. lost it. Anyway, I can use sodium thiocyanate, or even sodium thiosulphate, they at least perform the function of clearing the film density, so the reversal is opposite of the negative, not the negative + a whole lot more density that never got used. In any case, iirc, potassium thiocyanate does give finer grain. Which is why I wanted it, my photo supplier only has sodium thiocyanate, and it's pricey, and I already have that anyway. Well, the problem then is, how do I get to NH4SCN? I can get to a thiocyanate from thiosulphate and a cyanide, so
  2. I thought I typed up a reply.. lost it. Anyway, I can use sodium thiocyanate, or even sodium thiosulphate, they at least perform the function of clearing the film density, so the reversal is opposite of the negative, not the negative + a whole lot more density that never got used. In any case, iirc, potassium thiocyanate does give finer grain. Which is why I wanted it, my photo supplier only has sodium thiocyanate, and it's pricey, and I already have that anyway. Well, the problem then is, how do I get to NH4SCN? I can get to a thiocyanate from thiosulphate and a cyanide, so
  3. Well some research shows caffeine as a carcinogen or potential carcinogen, others say no.
  4. triple post... sorry one click of my mouse often registers as many clicks with no timing between them..
  5. I'm also not a food chemist, but couldn't you test for sugars with sulfuric acid? Also it may be worth hitting up a patent search for all those protein/amino acid supplements - the process they use. Also if you have something like http://www.proteindirect.com.au/?page_id=3 for your country (this stuff here is imported from U.S. iirc.. so you should?) You can get whey protein concentrate and isolate pretty darn cheaply without other crap in it. I don't know if that's helpful but just putting it out there.
  6. Hi all, I already have sodium thiocyanate which I can use for the purposes I want potassium thiocyanate (additive in b&w developer to make b&W or colour positive images in a reversal process on photographic film), but potassium thiocyanate gives finer grain. I was wondering how to get to potassium thiocyanate, online the most I can find is a reaction between a thiosulphate and cyanide. So a thiosulphate and potassium ferricyanide in some kind of function may give me what I need? Is it as simple as a 1:1 molar ratio of thiosulphate to ferricyanide? Do I need the potassium
  7. The other portion of your brain that is "not" being used is being used, it's there for repair and rebuilding pathways, but in a more complex way that I can state to you. Let's say telepathy and other such abilities exist in some people somehow somewhere. I do not think you should be deciding how they function and looking for what could support them based on existing knowledge of completely different functions unrelated to humans.. how do I say it... it's coming up with a conclusion and looking for evidence to support it, rather than gathering evidence and making a conclusion which y
  8. How about baking soda/sodium bicarbonate from the supermarket? That is food grade. Also you can bake or heat the powder to form sodium carbonate from that. You can also get food grade sodium hydroxide (not from the supermarket obviously).
  9. Hi, So bubbling chlorine through potassium ferrocyanide is a production method for potassium ferricyanide. I use potassium ferricyanide as a bleach for films with a halide salt. As it gets used, potassium ferrocyanide is formed. So I can regenerate this by bubbling chlorine gas through the solution. If I use Sodium Chloride (normally it's Bromide, but Chloride works fine for bleaching purposes too) I'll have less trouble, and the chlorine will also re-halogenate the solution, although perhaps I should use potassium chloride. In any case, my question is; Once all f
  10. Name's Dan and I'm an unwashed home-chemist peasant. Most of my chemical interest usually has some way of tying back to analogue photography. I live in Melbourne, Australia, and have accumulated a nice collection of useful substances
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