The exact words are "The dye known as indigo originated from a similar sea snail " There’s only one dye known as indigo (as opposed to dyes that produce the colour indigo, there are several of those, like woad) Like I said, lacking rigour.
The exact words are "The dye known as indigo originated from a similar sea snail " There’s only one dye known as indigo (as opposed to dyes that produce the colour indigo, there are several of those, like woad) Like I said, lacking rigour.