'Do they still steal colours at lunch-time ?' 'Not steal.

Attract is the word.

Of course they do.

I'm good--I only attract ultramarine; but there are students who'd attract flake-white.' 'I've done it myself.

You can't help it when the palettes are hung up.
Every colour is common property once it runs down,--even though you do start it with a drop of oil.