All these sticky, mucilaginous, resinous, tarry masses which refuse to crystallize, and which are the abomination of the normal organic chemist; those substances which he carefully sets toward the back of his cupboard and marks "not fit for further use," just these are the substances which are the delight of the colloid chemist.
An Introduction to Theoretical and Applied Colloid Chemistry, The World of Neglected Dimensions, Fourth Lecture (p. 134)