Abstract
Fluorescently dyed leaf trash of known particle size distribution (XN=66 µm) was prepared and blended into raw cotton which was subsequently processed in a model cardroom. The XN of the added leaf tracer collected in undercard and Pneumafil filter wastes was reduced to 64 and 54 µm, respectively. The XN of vertically elutriated leaf tracer was somewhat less (3.8 µm) than the XN (4.4 µm) of a small number of potentially respirable particles present in the raw leaf tracer. The fluorescent tracer technique, as applied to carding, offers a direct means of comparing the friability of the different botanical trash components found in raw cotton.