All margarines start-off BLACK! They are then pumped full of artificial ingredients to make them what you see on the supermarket shelves. They have a high content of polyunsaturated fat, which is good for you, but not in high doses. As a test, if you were to leave a tub of margarine and a block of butter out of the fridge for a long time, eventually the butter will decompose. Bacteria will get to the butter, as butter is full of natural goodness, but it will not go anywhere near the margarine. So, if bacteria doesn’t want to eat it, you don’t want to!