The present invention relates to a cationic 4-aminoindole of general formula, addition salts thereof with an acid and solvates thereof: in which: R1 is a linear or branched, saturated C2-C20 alkyl radical, substituted andor interrupted with a cationic radical. That is, a cyclonic separator able to remove particles from an air stream that are greater than a predetermined minimum while being smaller than a particular maximum. The projecting portions project more than a middle portion of the rear edge positioned centrally in an up-and-down direction of the rear edge. The cleaning tip includes a unique styled head which has both a rounded portion and a pointed tip located adjacent the rounded portion for cleaning underneath the rounded portion of the nail and the quick portion where the skin meets the nail. The treated hides are dry, flexible and readily rehydrated for further processing. The cable receiving portion is v-shaped in cross-section, and the open side of the v-shaped section extends in a direction of the pin.