Government of Bengal Industries Department Bulletin No. 6 Calcutta Research Tannery Report on the Investigation on the Indian Tannery Waters

The oldest process is perhaps that of Clark which in principle consists in the precipitation of the temporary hardness 133 the use of either milk of lime or lime water in large settling tanks After 6 to 12 hours' subsidence the clear water from the to is draw' for use. [...] This is done for the purpose of calculating the amount of softner that has to be added to remove the total hardness of the water. [...] In fat-liquoring specially with soap and oil emulsion the use of the hard water is dangerous as the soap combines with the lime and magnesia salts forming insoluble sticky lime and magnesia soaps which adhere to the surface of the leather and interferes with glazing. [...] The importance of the knowledge of the character of the watesupply p the tanner.—From what has been said above it will be clear that ail! ideal water for tannery would perhaps be the distilled or rain. [...] Investigation into the.shortening of the period of steeping coir husks by boiling in water and the possibility of the utilisation of the Extract in Tanning by Dr.