Clear
I agree with Marvin. Some of the clear meduims and varnishes are famous for yellowing. You can test this yourself very quickly. Just coat 1/2 of a throw away painted canvas with this stuff on one half and leave the other side bare. Set this in the sun for a day and look at it.
(Leave one side bare and do test areas..try several batches of stuff.) Draw a line and label each so you'll remember what went where.
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