I've made some coconut yoghurt from powdered coconut milk, tapioca flour, maple syrup and a spoonful of store-bought yoghurt. The mixture (apart from the old yoghurt) was simmered for a while, and the utensils had boiling water run over them from the kettle - except, come to think of it, the spoon used for the old yoghurt.
I left it for 24h in an incubator. It has a good consistency, but it has a pinkish patch and some yellow on top. The pink patch has a slight stringyness to it. I removed that part and gave it a stir and now it looks great, but I'm suspicious of it.
Has it spoiled?