Modelling patterns that depend on the underlying part colour

[Steffen]

the transparent part you mentioned, 2494pb07,
http://bricks.argz.com/bricksfiles/image...94pb07.png
http://www.piipoo.com/product_details.php?p=9632
uses the "fire logo shield" pattern,
http://www.ldraw.org/cgi-bin/ptdetail.cg...9p70s2.dat
There, the flame is still hardcoded red, which I consider being a Good Thing ™.

I suggest to do it the same way at
http://www.ldraw.org/cgi-bin/ptdetail.cg...209s01.dat