http://www.dakkadakka.com/dakkaforum/posts/list/8.page JForum - http://www.jforum.net http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390282.page http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390282.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390381.page http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390381.page GMT
There's also Golden's website where you can pick a colour and it will tell you how to mix it from their own paint range (which might give you hints on how to mix it from other paint ranges).

http://www.goldenpaints.com/mixer

And this site which will give you the resultant from mixing different proportions of certain colours....

http://trycolors.com/]]> http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390390.page http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390390.page GMT
Other brands of pigments had different effects. I don't know if the GW range has any thing like that. ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390761.page http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8390761.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8391184.page http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8391184.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8391289.page http://www.dakkadakka.com/dakkaforum/posts/preList/676946/8391289.page GMT