Quote Originally Posted by jbj
But, with respect, in strictly technical terms 1:3 further diluted 1:12.5 is not the same as 1:50

(1/4) * (1/13.5) = 1/54 not 1/50
It ends up as 1+50, not 1/50 concentration. The final ratio is 1/51... Which is what I dislike about the convention of writing 1:12.5 when what is really meant is 1 part A plus 12.5 parts B.