| As Nelly says, the problem is probably a dodgy seal which will be causing air to leak into the system (giving you the recurring bleeding problem) and also causing your fluid to turn black.
I've seen Ashley's bike and I don't know if his clutch slave cylinder is a standard one - it has a star shaped pattern on it, with lots of points (almost like a bi-hex socket!) rather than having the Ducati circle/D shape on it... if that helps! | 
antonye
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