The vehicles known by this name are in great favour with artists. They possess a gelatinous texture, which enables them, while flowing freely from the pencil, yet to keep their place in painting and glazing. The megilp generally in use is formed by mixing together equal parts of strong mastic varnish and drying oil. After remaining undisturbed for a few minutes, it assumes a gelatinous texture, resembling a thin, transparent, amber-coloured jelly. Megilp varies in colour, as it is made with either a pale or deep-coloured drying oil. The palest is made by using instead linseed oil, in which a small quantity of finely-ground sugar of lead has been diffused. With equal parts of this compound and of mastic varnish, a very light megilp is obtained. Another megilp is made by mixing 1 part of a saturated solution of sugar of lead in water, with two parts of linseed or poppy oil. These are well stirred or shaken together till they are combined; and then 2 parts of mastic varnish are added, and well mixed with the preceding. By this means a white creamy emulsion is obtained, which, though opaque in use, becomes quite transparent as it dries.
A compound used occasionally in combination with megilp, and consisting of 1 part of copal varnish; 1 part of linseed or poppy oil, and 1 part of turpentine, will furnish a pleasant and serviceable vehicle for general use. Care must be taken, however, to force its drying by the addition of ground sugar of lead, when employed with slowly-drying pigments.