Tannins are bitter-tasting chemical compounds that bind proteins .
Tannins are present in the following:
Tannins are also used in the treatment of leather , to make it more durable. Natural tannins for this purpose come from oak trees, but synthetic tannins are more used.
Non-timber forest products
Animal products Edible plants / roots
Betel
Fiddlehead ferns
Heart of palm
Mahuwa flowers
Sago palm
Sassafras
Saw palmetto
Wild ginseng
Wild onions
Bear garlic
Canada onion
Crow garlic
Twincrest onion
Pacific mountain onion
Ramps
Mushrooms
Bare-toothed russula
Bay bolete
Birch bolete
Cep
Chanterelle
Honey mushroom
Lingzhi
Matsutake
Meadow mushroom
Morel
Oyster mushroom
Parasol mushroom
Red cap
Saffron milk cap
Slippery jack
Truffle
Yellow knight
Allanblackia
Babassu
Bacuri
Candlenut
Capuacu
Carnauba
Chaulmoogra (Hydnocarpus wightiana )
Cocoa butter
Eucalyptol
Eucalyptus
Illipe
Japan wax
Kokum
Kombo
Kpangnan
Kusum
Mafura
Mahua
Mango butter
Murumuru
Nagkesar
Palm (kernel)
Phulwara
Pilu
Pongamia
Sal-seed (Shorea robusta )
Sandalwood
Shea butter
Tamanu
Tea-seed
Tea-tree
Tucuma
Ucuuba
Vateria indica
Resins Sap / Gum / etc.Other