Quote Originally Posted by paul_c5x4 View Post
No links, although the use of citric acid as a stop has been discussed on APUG quite a few times.
Is it as good as a branded solution - Somewhat subjective. Plain citric acid stop bath lacks the indicator dye used by the likes of Kodak, and it also lacks any buffering agents. On the plus side, it is dirt cheap, especially if you buy citric acid in bulk.
Is buffering agent a must have?

So, I can buy any citric acid say from freeBay, tea spoon (heaped? Level? Does it matter?) of the powder in 1ltr of water?

I can get 1kg for £5 which would last me ages, rather than ilfostop which at 50ml a session would last me 10 sessions in the darkroom and double the cost.