1 tsp. powdered orris root
2 tsp. powdered arrowroot

Systematically part the hair over the head, sprinkling some of the absorbent
powder along each parting. Leave on for 10 minutes, then brush vigorously until
the powder, dirt, and excess oil are gone.
Fine cornmeal or fuller's earth can be used in the same way. Mix them with a
drop or two of rosemary oil.
(end quote)

From The Complete Book of Herbs and Spices.