patnor1011
Well-known member
I talked to you over on eBay about it. It is enough for couple hundred of tests, that tin in there is to keep it fresh long time. You can top it up with fresh HCl after some time but as I said, it is something over 20ml. When you use one-two drops in each test you will have problem to run out. Standard solution is easy to make as Goran pointed out, few foils from card will be more than enough. I do have standard solutions made from Au, Pd and Pt and I used to sell it on eBay in small 10ml bottles but they are easy to make so there was not much interest in buying them.