Over the past thirty-something years, I have occasionally pursued the issue of the origin of drawn overlay beads—and how ancient specimens may have affected the manufacture of similar beads, and thus spurred the invention of white-heart beads (cornaline d'Aleppo) by Venetians.

Here's a strand of various beads that Jeff had, that includes some orange-over-black drawn beads. (I say "black" euphemistically, because I didn't determine what their true color is.)

JDA.