QUOTE(QM2 @ May 23 2008, 12:34 PM) [snapback]619972[/snapback]
Pelikan Blue, Green and Black: Try it at 45/45/10 to start with, and then adjust from there for a perfect match.
I did this after buying a vintage BCHR pen, which the seller told me prefers Pelikan to all other inks. So since Pelikan ink is cheap here, I bought the three bottles and mixed me a "Legal Pelikapis". Not bulletproof of course, and less saturated. But the colour match is excellent and the ink is very well behaved.
QM2
If you could snail-mail me a writing sample, I'll measure the color and show the exact delta from LL. If I measure the component inks individually too, I could suggest how to adjust the ratios to make a perfect match.
Basically, if you convert the measured RGB values to "optical density" values, the mixture will approximately add. In the mid 90's I worked for a company that made densitometers, including scanning robots that checked the huge web press sheets to make sure all the labels were the right color! I wrote code that did statistical analysis for QA and for adjusting the ink flow of the press. Seems like a lifetime ago now!
--John