INDIGO EFFECTS.

53 7

In case of orange, the pieces after treatment in the oxalic-muriatic bath,are washed and winced in the following mixture, at the temperature of1 Bo° F.:—

Water.300 gals.

Bichromate. 10 lbs.

Slaked lime, enough to make the liquid faintly milky.

When the orange pattern appears full and bright, the pieces are lifted, washedthoroughly, and dried.

For two shades of blue: a pale blue—the lighter of the two shades—is firstgiven to the whole pieces in the vat. They are then taken out, well rinsed inwater, then passed through a sour (sulphuric acid at 2 0 Tw.); washed again,squeezed, and dried. One of the reserves—Nos. 1, 2, 3, or 4—is then printedon, and the pieces are dipped again to the darker shade, and finished as forwhite on a blue ground. The result is a pale blue design on a dark blueground.

For two shades of blue along with white, a design is printed in chloride ofmanganese (muriate of manganese), thickened with British gum (dark), andraised with soda and chloride of lime, as in the “ Bronze ” Style. The piecesare then dried, and a further pattern blocked in with the reserve No. 1. Theyare next limed, and dyed in the vat to the required shade, lifted, hung up tooxidise, washed again, and winced in a sour of weak muriatic acid with theaddition of a little muriate of tin, washed again, and dried. The result is apale blue ground, showing a pattern in dark blue, where the indigo is super-imposed upon a bottom of manganese-brown, and in white where the reservehas been applied.

For two shades of blue, white, and yellow or orange, the process is begunas in the case just described, only, in addition to reserve 1, No. 7 or 8 is alsoblocked in. After passing the pieces through a sour of sulphuric acid, theyellow or orange is raised with bichromate, as directed under “blue andyellow.”

For blue and green No. 7 is printed on, and the pieces are dyed a full blue.They are then soured in dilute sulphuric acid, chromed, but not afterwardspassed through the oxalo-muriatic beck. The yellow combining with the bluewill form a green.

For two shades of blue and one of green, the pieces are first dyed a lightblue. No. 5 or No. 6 is then printed on, and No. 8 to yield an orange. Thegoods are then dyed, washed, soured, and chromed, and passed through verydilute nitric acid. Where the white resists have been printed the sky-blueremains, whilst No. 8 on the blue ground produces a green. The rest is darkblue. If the nitric acid is too strong the indigo may be discharged.

Another indigo effedt is the Lazulite or “ neutral ” style, at present little inrequest. Mordants with reserves are printed in ; the pieces are then dippedblue, when the printed portions repel the blue, and are dyed with madder.Of this style there are two modifications: where mordants for red, chocolate,or black, are printed along with a resist-white, and the pieces dyed a lightblue, the resist-white being in this case required to resist the blue only; andsecondly, where the white has to cut through the madder shades as well asthe indigo. Some of the colours for the former variety are here given: —