Hans, I buy my chamicals from VWR International. Their general home page is http://www.vwr.com, which leads to a lot of national home pages. They have the most user-unfriendly of all search engines, but you will eventually find nearly everything there.
Ole, THANK you for this information!! I just wandered through the site and it is amazing!!
I was a little skeptical about a European company ... usually the shipping costs are prohibitive ... but VWR has offices and *distribution* centers all over the place, including here is the U.S.A.
Someone here was searching for "Digital Thermometers" ... they have an extensive selection ... and I'm looking at prices of US$23, or so...
I've bookmarked this site... Hopefully they will prove to be a valuable resource.
Their search engine appears to be OK to me ... have they changed it?
VWR, Sigma/Aldrich, and Fisher Scientific are all good science companies. We order from them all here at my job. Prices for chemicals tend to be a bit higher, which may be because they are laboratory grade. But I don't think there is a chemical they don't carry. Also, if you have deep pockets they have some great laboratory equipment that makes for a very streamlined darkroom.
At least in Norway, there's usually a choise between ultrapure chemicals in miniscule quantities - or 50kg technical grade. Quite often the price is the same as well...
I have been unable to find Glycin, Amidol, or ammonium ferrioxalate. I have found just about everything else. The search is a lot easier if you have a CAS number. Some developing agents can be nearly impossible to find (e.g. Phenidone), others are easiest through the structural formula search (e.g. Pyrocatechol). This will probably differ a bit between the various national sites.
I now have a 25kg-sack of Sodium Thiosulphate which should be enough for a while...
Artcraft has Amidol for $51.00 in 100 gram quantity. Also $195.00 in one pound quantities. (www.artcraftchemicals.com). As I recall, I think that Aggie or someone on the west coast mentioned a really favorable price from a supplier in that area.
Art is a step from what is obvious and well-known toward what is arcane and concealed.
According to Minor White/Zakia/Lorenz in Zone System Manual: "Compaction development by two-solution method can no longer be recommended for modern thin emulsion films, because they don't absorb sufficient developer solution to continue developing in the second bath."
Any experiences about that?