D 5 aucis v.. I -ould be prep: ired with themsch es j 1'iu w Inch, by i eir jiar acidkyj and thi I oi' the earth (! . dispofcs pores of tfcw SUbftaUl B tO V. - the dyci i iiL- colours winch I . r'iy require sinii re red and yel- iVinii them* filaels is obtained by a partieul ou ; bat blue and fewii i quire uoite, at
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'W to SGOl . r. this sub- •'■ wl il : then to immerse it in the dyeing vat, stirring it well about, aad permitting it to remain tor a rter time, in pro- portion as the colour is intended to ir less deep. — The ingre- dients u>. ing blue consist of pas 1, woad, do : 1. PasTKL (isllhs t, ■■:!:, r:n i. ia prep • ig it when npe, then work- in- ii up, [nt< r dr ing ; which weigh in general from 150 to apQ j aed resemble a collection of small dry lumps of earth, intermixed with the fibres of plants, in order to extract the ur, it is necessary to provide large wooden vats, from 12 to lb feet in diameter, and u or 7 ieet high, or of a magnitude pre; oned to the quantity intended to be used. The preparation of the blue- vat is the raoit difficult process in the art of dyeing: and the practi- cal directions given by those who understand it, are either defective, Of mis-stated.—- The eopper-caal- D . ►hould b' 1 ch ir u> 1 l« r - pound* ©f ore ■■ 1 maddci, > of the r i about thttod k in the morning) and the mixture boil for an hoar and a halt, or two hour*, when the li- quor is, by means of a spout, con- I into the. vat, in winch a peck ofwheaton bran is previously in- ): i. The pastel -bulls are next ])ut in, separfll lj , whUe ths liquor is running into the vat, in order that try may be the more . broken and stirred with the rake, which is a semi - aureola* wooden instrument* having a long handle. Tiic mixture is occasi- ouaJiy agitated, till the vat has re- ceived all the hot liquor j and, as soon as the vessel is nearly half full, it should be covered with a lid.. somewhat larger than its own cir- cumference. A cloth should be likewise thrown over it, hi order to confine the heat after which ths whole should be suffered to sub- fer four hours 3 when it ought to be uncovered, m order to give it air, and to mix it thoroughly. No lim% as is generally, tiiouji fabeiy directed by dyersj should be put into the vutj but a small air-hole left on the top : the stirring and kion may once more be re- peated, at the expiration of three or four hours. If the ingredients, after these operations, be not yet ready and come to, that is, if the blue does not rise to the surface, but conti- nues to foam, it will then be neces- sary, after working the mixture v ad, to let it stand an hour and a hak longer j care be;ng taken dur- ing
