I'm a newbie to both the hobby and the forum.
I have been casting bas relief sculptures using a silicone mould and clay original artwork.
After burnishing the (bronze) resin casts with steel wool and then detailing with boot polish, I notice a white residue trapped in amongst the intricate parts of the artwork. A damp cloth takes the residue away from the prominent parts, but it is tricky to shift in the crevices etc.
Questions for the forum;
1) Can anyone tell me what causes the white residue?
2) What's the best way to shift it permanently from the artwork?