Now you've done it! You got me thinking...
I have some old boxes in the basement left over from our gun show days [70's/80's], when me & 3 friends (2 with FFLs) used to rent a table or two and sell stuff/guns at the regional show, 3 times a year...
I found a set of Jay Scott grips for a 1911, along with a Tyler grip for same...The Scott grips are what he called "Black Pearl" IIRC...The Tyler grip was 'imitation Ivory'...
(The Tyler Ivory came with a warning about breathing the dust if you worked it, leading me to wonder just how 'imitation' they were...made from real Ivory grindings/sanding dust maybe?)...
The 'Black Pearl' doesn't photo well; it has 'depth'...The 'Ivory' grips were solid white when I got them; the instruction sheet mentioned that they would 'age' to yellow just like real ivory...They sure did...And they now show 'plies'...Very strange...
The Scott grips are only 5/16" thick; but that backing was/is really annoying...
I was into Colt medallions back then; I milled my grips to take them...The Black Pearl grips here have stainless discs inset...I guess I ran out of medallions...