I expect you are right Jerry. Herter's Belgian Blue will coat gold with a wash of mercury which amalgamates with the gold...yes, the solution has some form of mercury in the formula. Nothing like very bright silver color for your gold!!
I have had the same problem as Mitch. I used Naval Jelly. The last large area I grayed I applied the solution several times and this gave me a really nice light gray smooth and even. I also, after rinsing apply a couple of coats of Renaissance wax with a bit of lamp black to darken the cuts...
Yes, that is what my "dub" looks like. It is on the face, just steeping the face at the point to near vertical in relation to the cut.
Sam's photo looks like the dub is on the tip of the face but steeper than (or passed) vertical. And I see no lift added.
Marty, that is much the same as I dub only I don't hold the graver quite vertical. The "itty bitty" tip I make is about .002" wide as measured with an optical measuring devise.
Jerry, I'm too lazy to change the dual angle settings and as I usually sharpen 10 or 12 gravers at a time and use some of them for other purposes I just do them all the same. The dubbing only takes a couple of seconds using a two very light strokes on the stone.
The dubbed face angle is in relation to the heel so with my usual 8 or 10 degree heel (lift) the tool has a 70 or so face in relation to the length of the tool or in other words about a 10 degree cutting angle. Close to vertical but off enough to cut OK.
For hard metal I double dub...I put a very small facet on the tip of the face at perhaps 80 or so degrees (compared to the heel) followed by rounding the heel very slightly. Cuts fine for me and lasts much longer cutting hard metals like stainless slides, etc. These are made on a fine grit...
Ren wax with a tiny bit of lamp black has become my go-to for the darkening. And also for protection for grayed areas such as scenes. Two coats blackened wax followed by two plain wax, wipe on, wipe off.
Philippe, this photo shows my way of sculpting scenes. From the right to the left...drawing design on metal, cutting outlines, removing background and then sculpting with scrapers, chisels and burinshers to smooth background and shape images. Detail was then added with dot shading (bulino).
There are two basic ways...using punches to move the metal around (non metal removal)...and using chisels, scrapers and burnishers to sculpt and polish the item (metal removal). I mostly use the sculpting method.