Ratanjot root color
Natural Black

It has been used as colorant for lipstick and rouge (cosmetics).

In alkali environments the alkanet dye has a blue color, with the color changing again to crimson on addition of an acid. The colour is red at pH 6.1, purple at 8.8 and blue at pH 10 to a dark   black at pH 14 Hence, it can be used to do alkali-acid litmus tests (but the usual litmus test paper does not use alkanet as the agent and its color change is closer to pH 7).