Standby: when bag become hardened, put it into boiling water cooking about 10 minutes until completely dissolved crystals into liquid. When it cooling may continue to use, reuse many times.

• 备用：把已变硬的暖手宝放入沸水煮约10分钟，直到结晶体完全溶解成液状。当暖手宝冷却后可继续使用，多次循环再用。