The Centering Gauge. This simple but effective tool makes finding the center of a line quick and easy. Use it when you are trying to center a series of lines. When you tear paper instead of cutting it you get a softer edge, but you don't get the irregularities of the deckle edge of a handmade sheet. However, by tearing your paper against the deckle edge of these rulers you get a deckle edge on your paper.
Keeps ink from crawling.
A life saver with some preprinted certificates. Add several drops to a bottle of Higgins Eternal for copperplate writing. Also used with gouache. Gum Arabic Powder. Add 7 parts distilled water to one part powder or add to bottled ink directly.