Pulverize the required quantity of whiting, which has been specially dried, and pass through a sieve of about forty-five holes to the square inch, mix the powder with as much raw linseed oil as will form it into a stiff paste, which should be well kneaded and left for a day or so, it must then be worked up, a small quantity at a time, so that it may be rendered quite smooth, and that balls of the dry whiting powder may not be imprisoned in different parts of the putty, for these would make their appearance when the putty was being used, and would of course injure the adhesiveness of the composition. Putty should be kept in an earthenware pan covered with a wet cloth. Putty which has become hardened may be made again fit for use by warming and beating it up, and kneading it whilst in that condition. For particular purposes, as for fanlights, iron-framed greenhouses, and other places where the lap or hold is very narrow, a little white lead may with advantage be added. To color putty, mix red ochre, lamp black, or other color with the whiting.