Inferior glue is said to remain damp and to become mildewed.
To make size, a piece of glue is placed in the pot and covered over with water. When melted, it is thinned by adding more water.
A pound of glue makes about a gallon of size.
Very good size may easily be made by boiling parchment clippings for several hours and straining them through a cloth.
Patent Size "is a gelatine, and can be used without any soaking as required for glue size." 4
Kilvin Dry Size is said to be colourless and odourless. It is sold in powder, and becomes gelatinous on cooling after a minute's boiling. It will keep several days in the hottest weather, and will not affect the most delicate tints.4
Parchment Size is used by gilders. It is made by dissolving shreds of fine parchment in warm water.
Gold Size, of different kinds, is applied to surfaces to be gilded, as a basis to receive and secure the gold leaf.
Burnish Gold Size is laid over a basis of size and whiting to secure gold leaf that is to be rubbed bright with a burnisher.
Japanners' Gold Size is made by boiling gum anime in linseed oil with driers. The process is an elaborate one, and is fully described in Spon's Workshop Receipts.
This size sets very quickly (in from 20 to 30 minutes when pure), and is used for gilding when but short time is available, also for repairs.
It is not so durable, nor does it make such good work, as oil size.
In gilding or japan work it is used as a basis to secure gold leaf or gold powder.