2306. Elastic Glue

2306.      Elastic Glue which does not spoil is obtained as follows: Good common glue is dissolved in water, on the water-bath, and the water evaporated down to a mass of thick consistence, to which a quantity of glycerine, equal in weight with the glue, is added, after which the heating is continued until all the water has been driven off, when the mass is poured out into moulds, or on a marble slab. This mixture answers for stamps, printers' rolls, galvano-plastic copies, etc.

2307. Sweet Mouth Glue

2307.      Sweet Mouth Glue. Sweet glue, for ready use by moistening with the tongue, is made in the same way as elastic glue, substituting, however, the same quantity of powdered sugar for the glycerine.

2308. Portable Glue or Bank-Note Cement

2308.    Portable Glue or Bank-Note Cement. Boil 1 pound best glue, strain it very clear; boil also 4 ounces isinglass; put it into a double glue-pot, with 1/2 pound fine brown sugar, and boil it pretty thick; then pour it into plates or moulds. When cold, you may cut and dry them for the pocket. This glue is very useful to draughtsmen, architects, etc., as it immediately dilutes in warm water, and fastens the paper without the process of damping; or, it may be used by softening it in the mouth, and applying it to the paper.

2309. To Make Mucilage that will Adhere to Glass or Polished Surfaces

2309.    To Make Mucilage that will Adhere to Glass or Polished Surfaces. We all know the difficulty of causing labels and similar objects to stick to glass or highly varnished articles exposed to the continued drying action of a very warm room. The gum or paste dries up and cracks, causing the label to fall off. One or two drops of glycerine in a small bottle of mucilage will entirely prevent this result. Too much glycerine must not be added, or the cement will fail to harden at all.

2310. Mucilage of Tragacanth

2310.        Mucilage of Tragacanth. Triturate 1 drachm powdered gum tragacanth in a mortar with 6 drachms glycerine; add by degrees, with constant trituration, 10 fluid ounces water. This will produce a mucilage at once, without the objectionable air-bubbles incidental to agitation.

2311. Mucilage of Tragacanth

2311.        Mucilage of Tragacanth. Macerate 1 ounce tragacanth in 1 pint boiling water for 24 hours. Then triturate until smooth and uniform, and press through linen. If pretty firm this paste keeps well without the addition of an antiseptic, although a little acetic acid or creosote will more effectually prevent fermentation.