Hello, 
Thank you for your feedback. I just selected the color in the editor "Street Complete expert edition" version 60.3 ( https://wiki.openstreetmap.org/wiki/SCEE ). I trusted this editor. I have not checked your indication that this color is invalid now. It could be that it is an issue with the "Street Complete expert edition" editor. You are free to delete the color again or change it to a hex value or report the issue to the Street Complete expert edition project. I am only a user of this editor.