The decomposition ecosystem makes quick work of our corpses when we die, letting loose a rich diversity of microbes and luring in flies from miles away. It’s a handy process for getting rid of carcasses out in the wild, but it can cause problems depending on the kind of funeral you’re after. Humans have a complex array of funerary practices on offer, from cremation to aquamation and even human composting, but for those who still want to go the burial route – and especially those who want an open casket – embalming is a good way of keeping the body in a presentable state. So, what does it all e…