A new highly sensitive detection tube for measurement of concentration of phosgene and diphosgene in air has been developed. The detection is based on chemical reaction of 4-(p-nitrobenzyl)pyridine and N-phenylbenzylamine which with phosgene (diphosgene) give characteristic red methine dye. As a copyright serves spherical granules (pellets) of composite material prepared by granulatio... https://danddcollectiblers.shop/product-category/cooker/