Soap Curd mottled

Blue and Grey Mottled Soaps.—These are silicated or liquored soaps in which the natural mottling, due to the impure materials used in the early days of soap-making, is imitated by artificial mottling, and are, consequently, entirely different to curd mottled soaps. 

Kitchen-etuff, as prepared by the Btuff-melters, is a very useful material for mottled soaps, and is largely used by the London soap-makers for this purpose. Being the produoe of Mtchen waste it contains many difierent kinds of fatty matter, hut after its separation from the more solid particles, as gristle, rind, bones, fibrin, etc., by pressure, it forms an uniform fatty mass of good consistency, and oontainB a considerable proportion of stearine, whioh renders it well suited to the manufacture of a curd soap such as the London mottled soap. 

Kottula s Soaps.—K. departure from the ordinary system of Boap-raaking was introduced by Dr. Hottnla about twenty five years ago, and at the time attracted much attention. In conducting his process, Kottula adds to ordinary curd, mottled, yellow, or other soaps, made in the ordinary way, fatty matters, lime liquor, concentrated soda leys and alum, with the object of producing a cheaper neutral soap than he believes was hitherto produced. The fatty matters he employs are such as are commonly used by soap-makers. He first boils soda leys until they have acquired the strength of about 30 B., and then adds to them alum, in the proportion of about lbs. to each owt. of ley. He then prepares a lime liquor by adding to any requisite quantity of water as much lime as it will absorb or take up, and to this lime solution he adds sal ammoniac in the proportion of about half a pound to each owt. of the solution. Sometimes he omits the sal ammoniac. 

The fatty matters, concentrated soda leys, and lime liquor are now added to the melted soap in such proportions that the fatty matters will become duly saponmed, and that the soap produced may be of the required description. The whole are then boiled in the usual way. The proportions of fatly matter, concentrated leys, and lime liquor may be varied according to the character of soap required. The following proportions are, however, recommended —Ordinary fitted soap, or curd soap, 10 tons fatty matters, 4 tons soda leys, prepared as above, 4 tons lime liquor, 6J tons, To produce a mottled soap be adds a certain quantity of ultramarine, oxide of manganese, or other suitable pigment, previously mixed with water, and the whole are then boiled together for half an hour, when the soap is ready for cleansing in the usual way. 

Its preparation is substantially the same as for curd soap, but the clear boiling is not carried so far. The art of curd mottled soapmaking lies in the boiling. If boiled too long the mottling will not form properly, and, on the other hand, insufficient boiling will cause... 

Weise s Formula for Windsor Soap.— Tallow 40 lbs. and olive oil 15 to 20 lbs., are saponified with soda ley of 19° B. the soap next treated with a ley of 15 B., and lastly with a ley of 20°, and the operation is conducted as for curd soap, but no excess of alkali must be used. When boiled clear, the soap is left in the pan for six or eight hours it is next completely separated from the ley, and is then placed in a flat mould, and pressed until it no longer exhibits any fl.ux, to prevent it from mottling. To the above proportions the following perfumes are added — Oil of cumin, 10 oz. oil of bergamot, 6 oz. oil of lavender, 3 oz. oil of origanum, 1 oz., and oil of thyme, 3 oz. 

Some lye, containing the impurities from the fats used, remains in the interstices of the curd, unable to sink, and as the soap cools it is enclosed and forms the mottling. The mottling may, therefore, be considered as a crystallisation of the soap, in which the impurity forms the colour. 

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