wth does 'b' do?

03/01/2016 19:37
i dont understand also how the heck do you mix colors im getting mad cause idk
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x-Xx_vortex_xX-x 03/01/2016 19:51
but then why does it say in the instruction 'b' brush/(pencil)
Najoepko 03/01/2016 19:41
it doesnt do anything