Silk paint by it's very nature will bleed anywhere it's not sealed in
with 'gutta' or another edging/sealing substance, as I'm sure you know.
Usually I make sure my pattern has an outer edge, or just stops
somewhere, and then make the whole of the silk outside that just one
colour, so there's nowhere to run. If you try to get chunks of different
colours out to the edges, and the edges are already rolled, you won't be
able to seal between the colours. Of course, if you hem/roll the edges
of the silk yourself, rather than using ready-made scarves, you don't
have the same problem - but you do have to make sure you stretch the
silk in some way that the edges aren't touching the frame, or the paint
will sneak along the frame!
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{'-'} The Crafty Owl
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