Many people are not aware that the shell of the nut contains a toxic, viscous and dark liquid, known as cashew nut shell liquid (CNSL), which is extremely caustic. That's why cashew is the only nut not sold unshelled.
CNSL is an important and versatile industrial raw material. It is used as an ingredient for powder for automotive brake linings and clutch disks.
In South America they threw the nuts away and ate the fruit, the flesh is spongy, fibrous and very juicy. They chew it just for the juice, spitting out the fibrous remains.
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