Transfer Material of Negative Boolean
In the Object Attributes dialog under the General tab there is a option called "Transfer Material of Negative Boolean". When selected, this transfers the material of the negative Boolean object in a group to the area of contact on the positive Boolean object.
For example, in the first image below, a green positive sphere is Booleaned by a red negative sphere giving a kind of green bowl with a red interior. The second image shows the same Boolean group but this time, the Transfer Material of Negative Boolean option is disabled, so the interior of the bowl is green.


To enable transfer material of negative Boolean:

To disable transfer material of negative Boolean:

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