Unsaleable

Because lettuce that flowers (through the process known as " bolting ") becomes bitter and unsaleable, plants grown for consumption are rarely allowed to grow to maturity.

However, fish can get "black gut", rendering them unsaleable, if sea butterflies are consumed in large quantities.

This process consists of pressure impregnation of otherwise unsaleable chalky American material by epoxy and plastics (such as polystyrene ) and water glass (sodium silicate) to produce a wetting effect and improve durability.