Polar bear fur is transparent, not white.
A transparent solar panel has been developed which can be used to power entire buildings with retrofitted windows
Whisky is clear out of the distillery and gets all of its color from the barrels during the aging process
Coca-Cola made a special clear version of Coke (at the request of President Truman) for Soviet Marshal Georgy Zhukov, so he could pretend he was drinking vodka rather than an American drink
Transparency is the only real antidote to abuse of power. Secrecy is its linchpin, its enabling force.
Lobsters have curious blood. It is normally transparent, but then turns blue when exposed to oxygen.
Spiders mostly have transparent blood
Transparency is not something anyone wants to be vis-a-vis others and certainly not vis-a-vis oneself.

Whiskey is completely colorless before the maturation process in the cask