Common putty is (or should be) a mixture of linseed oil and whiting of about the consistency of dough. A mixture of white lead worked in with the whiting is, however, superior for some purposes, and is better when but one coat of paint is to be put on after the puttying. To colour putty, stir the colouring matter in a little oil and then work and knead it into the putty until the whole is coloured. Keep putty under water. Do not leave it wrapped in the paper in which you may take it from the painter's, for the oil will be absorbed by the paper and the putty will quickly become dry and hard. Use a square-bladed putty-knife for flat surfaces, and do not use your fingers. See also Holes, To Stop.

Putty-Knife

An old case-knife can be used (better if re shaped squarely across or to an obtuse angle), or, in fact, any knife, but a regular putty-knife is best.