General Direction For All Recipes

Most of the dozens of recipes you'll find here and elsewhere are for single application amounts (exceptions are noted) natural ingredients without preservatives can quickly spoil or become rancid. By the same token, it is important that the recipe ingredients themselves be fresh; this means that once you have bought an oil, a vitamin, an herb, or some other dry ingredient, care must be taken in both handling and storage. The refrigerator (or freezer, for dry ingredients and some herbs) is usually the best place to keep natural, organic substances (even those--like bran--that don't "require" refrigeration), which should always be tightly covered and/or wrapped to keep it from drying out, becoming stale or picking up odors.

To repeat, in general, these preparations are not intended to be stored or saved. If you have very short hair, you may wish to halve the recipe.
By Richard Stein.