I don't know if this will be at all helpful (I know diddly-squat about carving amber), but I noticed while searching for the green amber cabs that www.sweetgemstones.com carries large chunks of Colombian copal amber at what seem to be very reasonable prices. The Baltic amber I found in a Google search was horribly expensive.
I’m sure I won’t be the only one to point this out, but sorry; copal
and amber are not the same thing at all. It’s like the difference
between wood and petrified wood, although the constituents of amber
polymerize over time instead of being replaced with minerals. Calling
it “copal amber” as you do above, or “new amber”, like the site you
mentioned, just confuses people in my opinion. Copal is tree sap,
pretty much unmodified. It mostly comes from Colombia, which doesn’t
produce true amber. “Colombian amber” can be taken as a geographic
euphemism like “Herkimer diamonds” or “German silver” to denote an
entirely different material. Copal can have interesting inclusions of
insects, etc., and it comes in much larger unfractured chunks than
amber usually does, which are sometimes of remarkable clarity.
Carving and polishing it is possible, but difficult, as it tends to
be gummy. Amber originated as tree sap, but it has metamorphosed into
a different material in the course of eons. Copal is at most some
hundreds of years old, as opposed to amber which is millions of years
old. Amber is easier to work with, its major drawback is
heat-sensitivity and a tendency to chip and fracture. The color of
copal is more pale than most amber - a clear light yellow is typical.
The best test I know of to tell the difference is to swab a piece
with denatured alcohol. This will have no effect on amber (or most
simulants), but copal will become sticky. Let’s use each material
for what it’s best suited: amber for making jewelry, and copal for
burning as incense…
Andrew Werby
www.unitedartworks.com