Methaemoglobinaemia is a rare but potentially dangerous haemoglobinopathy that is often underdiagnosed. It is one of the causes for unexplained cyanosis with dark-coloured blood. especially in the absence of cardiac or pulmonary pathology. Not uncommonly so. https://www.bekindtopets.com/quick-buy-Carhartt-WIP-Field-Bottle-Schwarz-hot-grab/