> kaolin/kaolinite) is=20 >=20 > Al2Si2O5(OH)4 >=20 > With a total of 9 Oxygens, I'm fairly certain that the Al and > Si is bound by the FeCl and the oxygen freed FeCl is a pretty aggressive chemical used in redox reactions, like water treatment floccing, to precipitate unwanted minerals http://en.wikipedia.org/wiki/Iron%28III%29_chloride As you say, a lot of gaseous elements involved. I'm wondering if the FeCl also goes after any cellulose fibres (a lot of O and H) stuck in the toner, it does tend to eat clothing. I have a particular T-shirt that looks like I took both barrels Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5751 / Virus Database: 4311/9346 - Release Date: 03/20/15 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .