healing vs. cloning
To remove dust (from a scanned photograph I assume), I first use the save as command to be shure I work on a copy and that the original is well protected, then I take a look at the individual channels. The usual culprit is the blue channel (when working in RGB that is). Changing original material in one channel only (I first clone, then eventually use the healing brush for finishing) is less of an interference than working on all three channels together. Besides: working in colour is always less predictable.
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