Multi-layer reaction mixtures that includes exothermic generating particles having a water soluble coating encasing a portion of the particles, a volatile component and, optionally, a buffer, an aqueous solution or both. At least two layers of the reaction mixture contain exothermic generating particles...http://www.google.com.au/patents/US20030105192?utm_source=gb-gplus-sharePatent US20030105192 - Multi-layer reaction mixtures and apparatuses for delivering a volatile component via a controlled exothermic reaction
