I agree with all that have posted so far. Go to your paint store and you can get denatured alcohol for $7 a GALLON. This should last you a while making small batches of finish.
Using that basic formula of Ms. Klein, I also use less oil, about 1/2 the regular measure. It seems to work better for me.
I do have something that was pointed out to me that really helped me with this finish. First, flood the area with the BK finish and allow it to get really sticky, almost dry. Then charge up your applicator with more finish and start burning it in. You should see it turning to glass about the time it is getting difficult to keep a small applicator in place.
I wait about an hour or so, then rechuck and buff with a soft cloth then burn on some Carnauba. Works like a champ. Glassy, deep, wet looking finishes can be built up with multiple coats of BK finish before waxing. Not my taste, but it sells my lamp pulls.
BTW, you should also know that this finish is not so hot for really porous or poorly sanded woods. As mentioned above you need to get the surface really smooth to close the pores.
Robert