Try a wipe over with white spirit or similar, will give an idea of what the different bits will look like once linseed is applied, some have turned out opposite than I expected in the past, for some I,ve used Colron Burmese teak dye, this would bring all the wood to a similar colour, needed a long time to dry before applying linseed.

To be honest, now I tend just to try and match the timber before hand, oil it and let nature take its course......
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