Antique Finish for Natural Pine
Gilsonite is a redder brown and asphaltum is a greener brown. Either way, these tars will have to be diluted with naptha or mineral spirits quite a bit, maybe more than 700% (7 parts thinner to 1 part tar).
The asphaltum will look more antique than the gilsonite because a greener brown is a more authentic anitque/aged look than a redder brown.
You could also add some flyspecking. Van dyke brown or raw umber specks will work. Your flyspecking material ought to be one which does not clump and leave a pimple shape. Glaze definitely leaves little mounds. Colored lacquer does not. But colored lacquer is a one shot deal and not very reversible unless you use a fast-dry thinner so that the specks are almost dry as they hit your surfaces.
For flyspecking I like UTC colorants mixed in VM&P naptha. If you don't like how they look, wipe them back off with a rag soaked in naptha. When they look right, spray on a light coat of sealer or lacquer to lock them in.
Try flyspecking over a vinyl or clearcoated sealed surface with TransTints mixed with water. If you don't like the effect, wipe it off with a damp rag. It doesn't leave mounds as there's no binder. You can flash dry it with a hair dryer if you're in a hurry.
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