Envelope Gum.
| Gum arabic | 1 part |
| Starch | 1 part |
| Sugar | 4 parts |
| Water, sufficient to give the desired consistency. | |
The gum arabic is first dissolved in some water, the sugar added, then the starch, after which the mixture is boiled for a few minutes in order to dissolve the starch, after which it is thinned down to the desired consistency.
Cheaper envelope gums can be made by substituting dextrine for the gum arabic, glucose for the sugar, and adding boric acid to preserve and help stiffen it.
Mucilage To Make Wood And Pasteboard Adhere To Metals.
Preservation Of Gum Solution.
ADULTERANTS IN FOODS: See Foods.
ADUROL DEVELOPER: See Photography.
ÆSCO-QUININE: See Horse Chestnut.
AGAR AGAR PASTE: See Adhesives.