Point XIX, and XX

Souldiers, Merchants, Travellers, Carriers, Fishermen, and others, who are much in the open Air, may of this prepare a Varnish in which they may dip linen Cloth, which will not permit either Air or Water to pass through it, with which they may defend their Boots or Cloths, so that they may travel dry in the rain. They who make Tapestry, may restore their faint and faded Colours, so that they shall be strong and beautiful.

Here mention is made of a certain mixture in which if Linen Cloth be dipped and dryed will not permit water to pass through, and it is done in this manner. There is nothing wanting in Linseed Oyl, but that the humidity be taken from it, which always hindereth its dying; now to effect that, there is no better way, than to boil the Linseed Oyl gently and gradually with the Flowers of Lapis Calaminaris or Saturn, (which are sublimed by Nitre) so long till the Oyl be tenacious, and groweth hard enough for this use. NB. That a Linen Cloth immersed in this mixture, and shining Talk being finely laid upon it, may be coloured of any colour, which will very strongly adhere to it, and may serve for the making of Tapestry. Therefore in this manner the nineteenth and twentieth Points are confirmed.