laitance in a sentence

1. And in its wake he demonstrated that lecithin, however obtained ( from egg yolk, carp fish eggs, fish roe, human brain ), and even though not totally purified, always yields a mix of oleic acid, margaric acid and glycerophosphoric acid when hydrolyzed, and under no circumstances whatsoever anything like phosphoric acid which would have been expected if ordinary fat matter acids, such as phospho-oleic acid, had been involved ( " Recherches chimiques sur la laitance de carpe . " " Journal de Pharmacie et de Chimie " 1851, t19, 406 ).
2. It's difficult to find laitance in a sentence.