Les Lavandères is a semisolid, dark gray-blue colour.

I named Les Lavandères, or the Midnight Washerwomen, after three old washerwomen in Celtic mythology. Names in various Celtic languages include the kannerezed noz in Brittany and the Bean nighe in Gaelic. The three old women go to the water's edge at midnight to wash shrouds for those about to die, according to the myth and folklore of Brittany; or to wash the bloodstained clothing of those who are about to die, according to Celtic mythology. The Midnight Washerwomen may be related to the old Celtic tradition of the triple goddess of death and slaughter. 

In Brittany, they can be an ominous portent, foretelling death, either one's own or a death in the family, though it is rare, just like they are not always represented as old women, though they always have very pale skin, being creatures of the night, and are often dressed in white or in traditional clothing. They are very agile and strong physically, even when they do not look so.

The Breton washerwomen wash graveclothes, usually at night, under the moonlight, and are notable for their intense dislike of being disturbed, cursing those who dare to do so. They are known to ask passers-by for help in wringing clothes, breaking the arms of those who do so reluctantly, and drowning those who refuse. More rarely, they can also give charity.

In Scotland, if one can get between the washerwomen and the water, they are required to grant three wishes in exchange for three questions answered truthfully. There is also a tradition in Scotland of a single washer at the ford, the goddess Clotha, who gives the River Clyde its name.