Observation: Plant resins.....the gummy exudates...

The pine tree oozing copious resins...I scarped to sniff at the aromatic fragrance..

Dried resin exuded from the Norfolk Island pine trunk...

These amber colored, crystalline, sticky blobs are the solidified exudates can be distilled into turpentine, a versatile compound with myriad chemical uses. These odoriferous lumps can also be used as incense or therapeutics.

Some conifer resin......

From another conifer...

Copious resin secreted from the bark of a gum tree ....

From an unidentified tree........

Sweetgum.............

Acacia........

Mastic...the resin of California pepper......

Mastic of sycamore...

Not sure if all of them have got economical uses.....