[David Lyga]

Paul, your milliliters are correct but let's say 1 + 14 (i.e., not '15') in order to avoid confusion. This (1 + 14) 'adds up' to the '15' working solution.

(1:15 is ambiguous both because of the colon and because of the '15'. 'What does it mean'? Does it mean 1 'to' 15? Some interprete that to mean '1 plus 15'. Some interprete it to mean '1' makes a total of '15'.)

Of course, Paul, we are assuming that brands other than Flexicolor will do what Flexicolor will do. Will that be a costly assumption? I think that it will work but I cannot guarantee that it will. - David Lyga