Canon USA had previously warned that the front rubber grips on some EOS Rebel T4i units may turn white due to a substance called zinc bis (N,N’-dimethyldithiocarbamate).
Today. the The U.S. Consumer Product Safety Commission recalled about 68,200 cameras sold by major US retailers for repair.

"WASHINGTON, D.C. - The U.S. Consumer Product Safety Commission, in cooperation with the firm named below, today announced a voluntary recall of the following consumer product. Consumers should stop using recalled products immediately unless otherwise instructed. It is illegal to resell or attempt to resell a recalled consumer product."