Traditional color litmus red origin

The traditional color litmus red origin of the saying is as follows.

1, it is said that litmus red first appeared in the Tang Dynasty, when the concubines in the court very much like this color, so litmus red is also known as "concubine color.

2, another theory is that the name of litmus red comes from a flower called "litmus", the color of this flower is very close to litmus red, so this name.

3, another theory is that the name of litmus red comes from a mineral called "litmus", the color of this mineral is also very close to litmus red, so it is so named.