The objective of this research was to study the use of diatomaceous earth as a micro-structured media for food safety sensors. The naturally occurring diatomaceous earth consists of fossilized remains of diatoms that are types of algae with a hard-shell structure. Traditionally diatoms have been used in paper based materials, as for example filler in paper making, filtration media, mild abrasive, absorbent material, and a thermal insulator. Perhaps its most famous application is for the stabilization material for dynamite. The functionality of gas sensor paper is based on pH sensitive dry that indicates spoilage of meat or fish products by color change. The reaction depends on the chromogenic material. For the detection of ammonia, produced during spoilage, pH indicators such as bromophenol blue or bromocresol purple can be used. The ammonia gas acts as a Lewis-base and induces the color change due to hydrogen releasa. Other gasochromic materials are complexes hance is induced through changes in the ligand field. By adding the diatomaceous earth material as a medium to the sensor paper. we developed a low cost, highly selective and sensitive detection method that can easily be integrated in the paper production process.