Here are some of my favorite colors in leaded enamels. As you will see I mostly use transparent enamels.
A few great colors to get you started.
B30 …these two are true yellows
N27…these three are green yellows
L21 very dark
If there is a B in front of the numbers this means it is from Bovano Enamel Supply Others you can order from E-namels.com and the are Ninomiya Transparent Enamels
But there is nothing more important than making your own test places!