The First Stain on Super Material Graphene: It May Be Toxic – Core77 Posted on May 10, 2014 by timbatchelder The First Stain on Super Material Graphene: It May Be Toxic – Core77. Share this:TwitterFacebookTumblrPinterestRedditWhatsAppEmailLinkedInPocketPrintLike this:Like Loading... Related Published by timbatchelder View all posts by timbatchelder