Abstract

A study has been made of the effect of tanning in the closed circulator system at room temperature, and the results compared with tannages effected at elevated temperature. Tannage is undoubtedly slower at ambient temperature than at 35°C, and it is established that at low temperature a period of at least 24 days, and in some cases more than 48 days is necessary to achieve what is attained in 12 days in a warm circulator system. The results of this experiment emphasise the considerable advantages of the tannage at elevated temperature.