It predates history.
Iridium was discovered in 1803 among insoluble impurities in natural platinum. Smithson Tennant, the primary discoverer, named the iridium for the goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts.
INSOLUBLE
Insoluble
This substance is insoluble in water.
A substance that does not dissolve is insoluble.
Pepper is insoluble.
The antonym of soluble is insoluble. Something that is insoluble does not dissolve in a particular solvent.
insoluble... i think.. :/
Only some salts are insoluble.
oils are insoluble in water
Yes, it is insoluble
Argon is an example of an insoluble gas as it does not readily dissolve in water or other liquids.