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I don't know why bruises are black and blue but i know that they are a bleed underneath the skin! The blood is deprived of oxygen and turns blue.
It means you are bruised - bruises are black and blue in color.
'Beating black and blue' means 'physically attacking someone to such an extent that he or she is left severely bruised'. (Bruises are black and blue in colour.)
My mother always called ecchymoses "black and blue marks."
I am sure you have had a bruise on your body in the past, a black or blue mark that fades to green or yellow before fading altogether. Abnormal bruising is just that, abnormal, bruises that do not behave like normal bruises: black or blue marks that follow veins (infection), bruises so painful that movement is hindered, bruises that have something solid in them, bruises that get larger, bruises of non-bruise colors (red, white), etc.
After a few days, you will most probably observe a dark scar if your cuts are not too deep. As for bruises, you might observe blue-Black.
I like black and blue better because they are darker colors. On another topic... in terms of injury with bruises, pink, green, and lighter colors indicate the bruise is going away... being reabsorbed by the body.
A bruise is characteristically "black and blue". As it heals, colors change to gray, green, maroon, pink. Finally, these fade to light pastel shades. Within 7-10 days, typical bruises heal and disappear,
This would have to depend on the customer and what cultural references they are exposed to. A blue van can be a classic looking work vehicle or it can also be seen as a reference to the rock band The Blue Van.
The medical term for bruise is contusion. More than one bruise or a large area of bruises is called contusions. Contusions start off as black and blue, but as they heal, they change to other colors.
Bruises LyricsI tried to do handstands for youI tried to do headstands for youEverytime I fell on you, yeah, everytime I fellI tried to do handstands for youBut everytime I fell for youI'm permanently black and blue, permanently blue for you.I tried to do handstands for youI tried to do handstands for youEverytime I fell on you, yeah, everytime I fellI tried to do handstands but everytime I fell for youI'm permanently black and blue, permanently blue for you-ooh-ooh-oohFor you-ooh-ooh-oohSo black and blue-ooh-ooh-oohFor you-ooh-ooh-ooh.I grabbed some frozen strawberries so I could ice your bruising kneesBut frozen things they all unfreeze and now I taste like....All those frozen strawberries I used to chill your bruising knees,Hot July ain't good to meI'm pink and black and blue for you.I got bruises on my knees for youAnd grass stains on my knees for youGot holes in my new jeans for youGot pink and black and blueGot bruises on my knees for youAnd grass stains on my knees for youGot holes in my new jeans for youGot pink and black and blue for you-ooh-ooh-oohFor you-ooh-ooh-oohSo black and blue-ooh-ooh-oohFor you-ooh-ooh-oohDo-doo-do-do-do-do-dooDo-doo-do-do-do-do-dooDo-doo-do-do-do-do-dooDo-doo-do-do-do-do-dooDo-doo-do-do-do-do-dooDo-doo-do-do-do-do-dooDo-doo-do-do-do-do-doo
Bruises are made when blood escapes from a torn blood vessel underneath the skin. As the bruise ages, the blood is dissolved back into the body. Different components of the blood are different colors, so it changes from dark red to purplish to yellowish as it ages.