Adulteration process color

Adulteration,—Should it be desired to ascertain whether ordinary carded cotton has not been added to sophisticate the gun-cotton, it may be arrived at by the following micro-chemical process. A small portion of the cotton Is impregnated with a solution of iodine, and a drop of sulphuric acid added, and then submitted to the lens the gun-cotton is very feebly affected by this treatment, and reteins the yellow coloration communicated by the iodine only slightly intensified after some time, whilst under the same treatment the fibres of ordinary cotton would quickly disintegrate, and partake of a lively violet hue, The intensity of the latter will be a comparative indication of the probahio amount of the adulterants. 

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