If a carved black utensil is heated to high temperature and then brought in dark then which will shine more amongst carved part or utensil?

If a black body is heated at a high temperature, it seems to be

A polished plate with rough black spot is heated to a high temperature and then taken to a dark room, then

If a mole of hydrogen molecule is heated to a high temperature then which of the following reactions take place ?

Among light and dark reaction which reaction is more temperature affected?

Four copper plates of the same dimensions are painted with red, green, white and black colours. All of them are heated upto a temperature of 300^(@)C and then allowed to cool in the surrounding, which is at room temperature. Which plate would cool at the earliest?