Black and white dragons are angered when 'g'iven dragon scale mail of the opposite color
Black dragons are angered by 'g'iven *white* dragon scale mail, white ones by black DSM.
Problem
Dragons can be angered by giving them dragon scale mail of their own color - however, this effect is swapped for white and black dragons, which will ignore armor of their own color and get angry if given the opposite one.
How to reproduce it
Give a white or black dragon of any kind a dragon scale mail of its own color and watch how they refuse to take it. Now give them DSM of the opposite color (white <-> black) and see how they rip it apart. Compare this effect to red and blue dragons, which are aggravated by being given armor of their own color.
Notes
N/A