PAPER AND BOOKS
Reading edition
TO MAKE WATERPROOF PAPER
Mix sulphuric acid of an exact strength with one-half its weight of water. A sheet of common paper placed in this solution becomes hard and fibrous, yet its weight is not increased, and it makes a better parchment for writing purposes than animal parchment.
TO RESTORE FADED WRITING
Moisten the paper with water, then brush over with a solution of hydric-ammonia.
TO PREVENT MOULD ON BOOKS
Wipe the shelves with oil of cedar.
TO CLEAN SOILED BOOKS
Use two parts of water to one part of vinegar, rub over the soiled pages, and leave the book open to dry.
Book covers soiled by grease may be cleaned by putting pipe clay or French chalk over the spots, then applying a warm iron.
To clean the edges (where they are not gilt edges) close the book tightly and erase with an ink eraser.