Quote Originally Posted by pdeeh View Post
So, just to clarify for people like me (gave up mathematics and chemistry age 14, find ratios difficult to grasp sometimes, has to calculate the dilution on a scrap of paper each time I make up some developer) ...

10g/l = 1% solution
100g/l = 10% solution
200g/l = 20% solution ... and so on, up to the solubility limit of KBr in water I presume.

SO, when I am making up a litre of developer that requires 1g of KBr per litre, I would substitute 100ml of a 10% solution for 100ml of the total volume of water required by the formula ?

(I imagine a lot of sighing, eye rolling and shaking of heads from all the scientificky types at this point)
Yes - this is correct!