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It seems as if this process did not have any effect at all, but when you render the scene you will see coloured spots. It is very likely that the result does not meet your expectations, because it lacks contrast. To fix this, proceed as described here:
Open the plugin's “Vertex” “MD” panel (only available with MD files) panel.
Look for the channel you have used in the white material, e.g. “Age”.
Increase or decrease the channel's “Scale” parameter to change the ratio between the colored areas until you get the desired result.
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