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
Pepper is insoluble.
A substance that does not dissolve is insoluble.
This substance is insoluble in water.
The antonym of soluble is insoluble. Something that is insoluble does not dissolve in a particular solvent.
Yes, it is insoluble
oils are insoluble in water
insoluble... i think.. :/
Only some salts are insoluble.
because it is just insoluble