(6) White sour, sulphuric acid at 2° Tw.; wash well.
The length of boil with the lime and lyes will depend upon the quality of the goods, heavy goods will require from two to three hours longer than will light goods, such as cambrics, the time given above being that for heavy goods, sheetings, etc.
Another process is the following:—
(1) Lime boil, using 480 lb. lime, and boiling for ten hours.
(2) Grey sour, hydrochloric acid at 2° Tw.; wash.
(3) Lye boil, 300 lb. soda ash, 58 per cent.; 50 lb. caustic soda, 70 per cent., and 30 lb. soft soap, giving ten hours' boil; wash.
(4) Chemic as above.
(5) White sour as above; wash well.
A smaller quantity of lime is used here, but on the other hand the lye boil is a stronger one. This process gives good results. Some bleachers do not use lime in their market bleaches, but give two lye boils, in which case the process becomes: