SILKS.

631

No. 4. Black (Cylinder or Block ).—

Logwood liquor, at 14° Tw. 2 gals.

Starch. lbs.

British gum. 3 i >>

Boil, cool, and add—

Nitrate of copper (crystals) . lbs.

Nitrate of iron . 1 lb.

No. 5. Black .—

Logwood liquor, at 6° Tw. 2 gals.

Galls, in fine powder. 7 ozs.

Boil down to 1 gallon, to which add—

Starch . 1 lb. 10 ozs.

Boil, and when cold add—

Alum . 2 ozs.

Sulphate of copper . 6| »

Copperas . 2 ,,

Nitrate of iron, at 80° Tw. 4 s >>

Palm or cocoa-nut oil. 5 s »

No. 6. Blue .—

Logwood liquor, at 15° Tw. 1 gal.

Red liquor, at 15° Tw. 1 »

Ground gum. 10 lbs.

When all is dissolved add—

Tartaric acid.to ozs.

Nitrate of copper, at 8o° Tw.10 „

Extradl of refined indigo .. .. 1 gal.

No. 7. Blue (Extract of Indigo ).—

Extradt of indigo (finest). 3 lbs.

Boiling water . 1 gal.

Alum . 8 ozs.

Tartaric acid. 1 lb.

Gum . 6 lbs.

No. 8. Royal Blue .—•

Yellow prussiate. 3 lbs.

Hot water . 1 gal.

When dissolved add—

Tartaric acid.. . ij lbs.

When cold thicken with—•

Gum, ground. 7 lbs.

Add—

Perchloride of tin, at 8o* Tw.•. 2J lbs.

These mixtures are to a great extent superseded by the aniline blues, whichproduce the finest effedts upon silk.