Gum copal

Gum copal, also known as manila copal, is a resin produced by the sap of the forest tree (Daniellia sp.), due to common impurities and differences in regions, gum copal ranges in colors from blacks to yellows to whites. Gum copal, along with ivory and slaves, was a significant export from East Africa in the nineteenth century. Gum copal exists in a state very similar to that of amber but with some primary differences. It is commonly mistaken for amber and oftentimes sold at gem shows or other areas as amber. Unlike amber, gum copal is usually only 100-1,000 years old and it has not yet fossilized. Gum copal usually sells for $750-$1500 USD per metric ton in rock form and $1500-$6500 USD Per metric ton in powder form.

PWS- This is the highest grade for gum copal, white in color and 99-100% purity, it is used for making varnish specifically for wood surfaces. Its result is very good luster and very good in resisting external scratches. Plus it dries to a hard and shiny film.

DBB- This grade is pebble sized and whitish yellow in color with about 90-95% purity. This is an economy grade and ideal for production of low end varnishes, its solubility is good. It can contain some black copal but it is still perfectly and easily dissolved in alcohol solvent mixtures. It is also the most common use for incense.

WS- The lowest grade for gum copal with larger chunks and black in color with about 60% purity, the impurities include treebark and soil.

Powder- The leftovers from the processing of PWS and DBB, usually used for varnish.

Gum copal is a semi-fossilized, amorphous resin which has a unique set of properties such as resistance to water, solubility in alcohols, and has the ability to give glossy finishing along with possessing superior binding abilities.

Chemical Structure: C₂OH₁₇FO₃S

Melting Point: 90-130 °C

Hardness (Mohs Scale): 2-3

Refractive Index: 1.539-1.545

Saponification Value: 140-170

Gum copal has a very wide variety of uses in both past and present times. Primarily used as an incense by ancient civilizations, it also found usage as an early form of glue, and traditional medicine for cases such as dysentery, stomach pains, dizziness and fright. It was often used in religious occasions too in the form of sacrifices to deities (typically associating the copal as food for the gods).

Today it still finds popular usage as an incense. In addition, it finds a niche as being a varnish or waterproofing material (as when it is heated with certain oils, it becomes nearly transparent). It also can be used as ingredients for adhesives, perfumes, printing ink, paints and films.

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