This is the untouched photo of the hetia blue glow under UV. It does not look that deep a blue in person but this is how the camera catches it..The funny thing is only part of it glows the blue...
I wish I could figure out these things but its not a reliable test but it can give one a direction.
Did you hear about the Chelsea filter? View attachment 3987918
Your dark blue hetian just looks like its reflecting the uv light. Still part of my hetian is a beige yellow color under UV.
Some yellows on jadeite do glow under uv light from my experience, but usually in specks. I honestly don't know what to say. I didn't think hetian glowed under uv light. I wish I could be of more help.