@aewarren
I also have a dozen or so "clear" vinyl records. I believe the process is not simply removing the carbon black but requires a replacement compound to obtain that clarity.
The translucency is quite often a telling of the quality of the vinyl (virgin) used . Japanese pressings and British and German pressings using quality vinyl also were translucent even in black.
I have many British pressings that appear black but even in low natural or incandescent light they are actually a deep see through plum purple color.
No filler and higher quality (controlled) ingrediants .
Like the old softer red odeon pressings. Clear pressings still require an added compound in place of any other colorant to make them. Still colored to be colorless . Its all relative to the quality of materials used and the quality input from machines and the humans setting them up and handling them. I'm constantly amazed at how good many records do sound in context to my previous sentence.