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Sorry Darren, I don't buy the chain crud getting into the fluid.
The seals would have to be in poor shape to get past with the clutch system under positive pressure.
My theory is that there is sometimes, some rotation in the slave, of either the piston and/or seal. the contamination might be dark material from the seal itself or more likely material from the friction between the piston and cylinder. Both being aluminium they would produce dark or black matter.
I know the piston ought not rotate but I bet it does ...quite a lot probably...That's my theory anyway.
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