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Peter,
Excellently and concisely stated. I couldn't have said it any better than that, as is evidenced by the fact that I didn't.
Just as a further note; I've recently taken to adding some calcium carbonate to, primarily, scumbles. I have found that this way even the thinnest, rubbed-on layer stays put and does not seem to darken to invisibility, as so often happens when trying to lighten a passage with a thin, transparent over-paining. The CaCo3 seems to add just enough body to the paint for it to stabilize at whatever opacity is required of it.
All the best.
Juan
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