A bruise is blood that has escaped from small vessels and has now to g. It lo red a first a then dar, because t haemoglobin i it lo its oxy. Over the following days the body takes that haemoglobin apart, and the fragments it passes through are themselves coloured: one of them is green and the next one is yellow. The sequence you watch on your arm is a chemical breakdown running at its own pace.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.