I noticed in the anime that curse energy is portrayed as a blue flame with a black outline but the description of her curse energy is red?
actually took some notes from gojo,, im not sure but in one scene when he uses his reverse curse technique its red.
So while taking some notes for the series and her technique Uh dnndhdd basically curse technique is like negative emotions,right? but since y/n is technically using reverse technique to heal people, its a more complex technique that uses positive energy (basically why she had to go to school to master it) so instead of using negative emotions, its negative times negative. Then u get Positive energy 😭 so since ur not using negative energy anymore, the colors bound to change right? (Or am i wrong bye hehshs im so dumb pls but yeah basically got inspo from gojo since his reversed technique is color red!)