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Clear varnish seems to increase the contrast and it brings out the colour of the wood overall. Tinting first means you can change the background colour (usually more red/brown) which reduces the contrast with the grain as that's already darker/browner.
I find it's a word of pain and painting with one colour helps hide any changes/knotting or repairs that the door has or needs.
Having said that my partners place has stripped pine doors unvarnished showing years of repairs and alterations in every room in the house.
Oops, think I misunderstood:
I guess I'll go slightly darker, the wood if fairly light already.