Blood that remains in the uterus for an extended period reacts with oxygen and has had time to oxidize, resulting in a dark ...

You can expect to see red blood when your period is at its heaviest, usually during the first few days of menstruation. Dark pink: heavy blood mixed with discharge If your period blood appears ...

Period blood isn't always red in colour, and a variation in colour could mean lots of different things, so there's no need to ...