Types of amber, copal and resin is from Gary Platt's Amber Home . Copal is from Mark R. Meyer's 3dotstudio . Ancient nucleic acids from amber-preserved insects is from the London Natural History Museum. Copal and other amber imitators is a topic found at the Amber Gallery . Copal identification , by Gary Platt, is hosted by Bob's Rock Shop .
Colombian amber is a site from Stones and Bones .
Yale Goldman discusses copal , and other amber imitations, such as glass, phenolic resin, celluloid, and casein, from his Dead Bug in Amber Club site. To the beginning. Ken's Fluorescent Minerals . Encyclopedia Britannica . Jewelry Central regarding amber .