shading?
 

im going to paint a shell which i will be putting a yellow splat with drips what colour would i use for shading the drips? thanx

Maybe Auto Air transparent smoke around the colour, or maybe go with a light blue or faint pink around the yellow then the smoke.

depends on the effect you are after. generally i would say green, orange or purple.

you can obviously tweak those colors as needed.. for example adding a tiny amount of black to the purple, using that..bring in the shading further by doing a few passes with an orange .
or
add some dark green to yer flo green and do some shading then come in with a few passes of straight flo green before laying the yellow.
etc etc

Couldn't agree more as soon as I read the question I was thinking the same, what colour is the rest of the shell going to be?

yellow splat over metalic red:thumbsup:

I'd go for some orange mixed in with the yellow. Back it with White for maximum brightness.

To shadow it onto the red I'd go with some darker red or a spot of purple in the red. Black would be okay if it's a transparent colour but solid black is probably too much.