COLORIMETRIC GAS DIFFUSION TEST TUBE

摘要

A colorimetric gas diffusion testing tube is disclosed that is to be opened at one end and that contains a granular indicator layer. The testing tube detects a gas that does not directly change the color of the indicator layer. When the tube is viewed from the end which is to be opened, the indicator layer that is adjacent the opening end is inert to the gas that is to be detected. The indicator layer is followed by a porous reagent layer for converting this gas into the substances that change the color of the indicator layer.