Thanks to a single Tumblr post from a disgruntled comic book artist, fans the world over are currently tweeting their admiration for their favorite colorists.

For those not in the know, a colorist is, unsurprisingly, the person who adds color to the illustrator’s black-and-white art—a job that can completely transform the mood of a comic. Understandably, some colorists are annoyed that their work does not seem to be valued as highly as that of their colleagues.

Jordie Bellaire, who has worked on a variety of big-name comics including Winter Soldier and last year’s popular reboot of Captain Marvel, posted an open letter to an unnamed convention, titled “I’m mad as hell and I’m not going to take it anymore.” She writes:

“Your archaic view of creatives is part of what keeps jobs of this industry undervalued. Congratulations, you’ve officially locked out a great percentage of talented, friendly, hard working creatives who would originally have had great interest in attending your convention.

Your one sentence, ‘this is not a colorists thing’, was surely the most pigheaded and dismissive thing I’ve been told since I began professional coloring… [READ MORE]