Okay, it's a couple years since this thread, and the price of Gold Chloride has gone up.
PhotoFormulary--$30/gram (solid) if you buy 10 grams
Salt Lake Metals--$26.24/gram (in 1% solution calculated by metals basis--the amount of pure gold, so about a 1.5% solution calculated the way photographers normally do it, sold in 50ml or 100ml bottles)
Anyone finding better prices out there? Anyone good at predicting the gold market (currently around $470/oz)? If I can wait a month or two, should I?
Considering that gold has long been the haven of choice during times of uncertainty, I don't see gold prices declining in the near term.
I believe the ounce used for precious metals is the Troy ounce which is 31.1 grams.
Has anyone tried contacting Englehar(d)t or others that sell it fairly cheap by the 100 gram?
I think that's Engelhard. I'll contact them.
Checking the big suppliers, price depends on purity. What purity do I need for photographic purposes (I'm guessing it's less than is required for medical purposes)?
I believe Lab grade is fine. I also have another contact at work I will pull down on Monday for us.
Thanks. I e-mailed them and it bounced, so I'll try calling during the week.
Considering Ole's post above, the prices that others have been getting in the past, and the lab conditions that most photographers work under, I suspect 99% purity should be good enough.
David, I suspect purity is related to use.
In silver halide emulsions, the gold used must be pure of all other heavy metal contamination or you can get problems. For example, iron contamination at any time in the making of silver halide emulsions is very bad.
So, purity above some level may be important depending on use, and the type of impurity may be important as well. This is why analytical and reagent grades are supplied with a certificate of analysis on the bottle.
Of course. I'll be using it as a toner for albumen printing.
$13 per gm is actually very reasonable.
I went from being a Photographic Chemist in 1986 to being a precious metal refiner and have 18 years experience of Gold refining, many kilos of fine gold per day :-)
Your price of $13 is actually well below the norm for laboratory grade Gold Chloride.