I thought I'd mention a useful coloring
tinting agent I've used for a very long time.
That is Old English Furniture polish, mainly the
dark type. It comes in Dark and Light tinted
types.
I've found it mixes well with most kind of oil
based finishes like tung oil, linseed oils, danish oil, even the tru-oil polymer based finish.
The drying time may be longer with the mixed
finish, but I've found it works as well or better
than chasing down the various tints to color
wood work.
It also is useful for light sanding in wood to fill the open pores to create the wet slurry pore filling step. Useful agent too for burnishing in with steel wool the final top coat step. I used to do all manor of mixes to color wood. Nowadays I'm down to this one color mixing medium.
I recently burnished in a coat w the Old English
agent and 4/0 steel wool to produce this last
medium satin, sorta shiny look, on an exc set
of Curt Harlows Roper grips. His finish work
is terrific allways, but I was just piddling on them lately.
I hope this helps the folks here in your restoration/ grips work. It has worked well for me for many years. A few pics for you here..
Best Randy