E—M water treatment agent for boilers,composed of ethylenediamine tetramethylene phosphonic acid(EDTMP) and hydrolyzed polymaleic anhydride (HPMA),and its applications are introduced in this article.
Using the etching needle, litho crayon, various aquatint solutions, or greasy tusche washes on copperplates or lithostones, artist such as John Cage, E.