In one embodiment, the sensing composition precursor comprises a dispersed aqueous liquid including a sensing component dissolved therein,...http://www.google.com/patents/US5284775?utm_source=gb-gplus-sharePatent US5284775 - Blends of sensing component, polymer precursor amd hydroxy-alkylcellulose dispersants; detecting carbon dioxIde in bloodAdvanced Patent SearchPublication numberUS5284775 APubl