View Full Version : how much npa to mix with apc?

05-05-2002, 10:37 PM
i just ordered some npa and i am down to my last bit of apc and i wanted to mix that last bit it. i have a 1 oz bottle and if you flip it upside down, the remaining liquid lines up exactly to where the label starts. i would say there is a little more than 1/4 left. so how many drops should i add to this last bit to have a 70/30 mix?