I can only see on certain people especially when they are very emotional. As you said, it is aura. Energy field around living beings and at times on objects.
I know a lady who does healing together with her her ability to see aura in colors. Her name is Madam Paru and she's from Malaysia. Perhaps you can try to email her. Her name is listed on this website, https://annejones.org/find-a-healer/