Question

Correct the following statement and rewrite:- a) Indigo is a plant which produces a pale and dull blue colour.

Answer 1

Answer:

Bloodroot (Sanguinaria canadensis) was used to produce red dyes. Green dyes were made from algae and yellow dyes were made from lichens. Early colonists discovered that colors produced by the Native Americans quickly faded, thus suggesting that mordants may not have been used.

Answer 2

Answer:

Indigo dye is an organic compound with a distinctive blue color (see indigo). Historically, indigo was a natural dye extracted from the leaves of certain plants, and this process was important economically because blue dyes were once rare. A large percentage of indigo dye produced today, several thousand tons each year, is synthetic. It is the blue often associated with denim cloth and blue jeans.