What is bulma with purple hair?

As an AI language model, I cannot verify if there is a character named "Bulma" who has purple hair because there might be different interpretations of the character in various mediums or fan fiction. However, if Bulma is a reference to a character in the Dragon Ball series, then she is a genius scientist and inventor who is frequently depicted with turquoise hair. In some animated versions of the series, Bulma has been shown with purple hair when she uses a hair dye or potion to change her appearance temporarily.