Copal samples:
A. Recent resin (0-250 years old)
1. Colombian copal and others South American copals
2. Madagascar copal and Kenya copal
B. Ancient resin ((250-5000 years old)
1. Philippine copal
2. Beach Dammar batu (Borneo copal found on the beach)
3. Cotui copal
C. Sub-fossil resin (5000-40,000 years old)
1. Mizunami copal
2. Angola copal
3. Congo copal
4.Some Kauri gum
D. Fossil resin (40,000 and older)
1. Kauri gum
2. Zanzibar copal
3. Cambay 'amber'
4. other Japanese copal
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