Nicolas Arnoult, Recueil des modes de la cour de France (1687) LACMA
How to make ones haire to become of a yellow Golden Colour. Take the rinde, or outward parings of Rhubarbe, and put them to steep in Whitewine, or clear Lye; wet a spunge or linnen cloth therein, and anoint your haire therewith, and let them dry before the fire or sunne; the oftener you do this the sooner they will become yellow: note that before you use this, it is good to clear your head and hair from sweat, and all other filth whatsoever.
A Brief Collection of Many Rare Secrets
Your new summer hair look: golden color, rhubarb flavor, and no filth whatsoever.