The Journal of the Board of Arts and Manufactures for Upper Canada, June 1867
The article to be bleached is immersed in a solution of permanganate of soda, which has been rendered slightly acid, and is stirred about for a few minutes, with a glass rod. It is then plunged into a solution of sulphurous acid, which removes the violet brown oxide of manganese deposited upon it in the first bath. After the successive immersions in the two fluids have been repeated two or three times it is found to be beautifully white, without its fibres being the least impaired in strength. In this, as in all the processes which have been used for bleaching, oxygen is the a out which destroys the coloring matters; but is ere applied in the form of ozone, which is disengaged from the per manganate by the organic matters.
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