It sounds like you have mold on your bread...........Dont eat it....you can get sick and die,seriously, throw it away!
bread gives black-blue or deep blue color with iodine because starch is present in bread. ...
Starches turn blue-black when stained with iodine (which usually stains things a reddish-brown or amber color).Iodine turns blue black when starch is present
The material formed is Carbon.
Iodine solution turns blue/black
It turns blue-black
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.
Starch
Starch
Starch.
It turns blue-black if starch is present.
Turns blue black
Dark blue very, near to black