The present invention utilizes the advantages provided by a portable, wearable timepiece such as an electronic wristwatch for integration with a security system and performing various functions as a result of the timekeeping integration. In one embodiment, a method includes capturing a first image of a document. Liquid compositions fortified with calcium citrate according to this invention have superior dispersability, solubility, appearance, and storage stability. Each processing node may independently process a block using an effect. The electrophotography rubber member or sheet-separation rubber member is formed of a rubber elastomer containing a polyurethane formed from a long-chain polyol containing a polyester-polyol having a number average molecular weight of 500-5,000 and an ester concentration of 2-8 mmolg, wherein the ester concentration is defined by the following relationship: Ester concentration.