For an excellent material, where liquid driers are undesirable, and for a batch of 500 lbs. the following ingredients are used:

250 pounds best bolted American Paris white,

125 "

fine white barytes,

75 "

siccatized linseed oil,

50 "

special solution as above.

Note. The siccatized linseed oil is made in the cold way in a revolving barrel or drum as follows:

For 25 gallons placed in the apparatus, add 50 pounds sifted litharge and let it revolve by power for 8 working hours, then draw the resulting oil into a settling barrel or tank and permit the oil to clear. The residue, which consists of litharge and oil foots can be used with cheap roof paints.