How do I stain or paint a white glass bowl light fixture to tea stain

Use glass paint

Rubbing on dark furniture wax (Old English) could work like a stain.

I did one years ago using a Walmart $1 metallic gold paint. Used my fingers to "smear" it lightly on. I kept putting a little more on until I was satisfied with the result.

They now have seaglass spray paint in a brown color

Use Glass Paint from Craft Store.

Maybe you could use Liquid Shoe Polish.......

Watered down paint would not be translucent so that would not be my choise. I would look for stained glass paint at a craft store.

Try antiquing medium. Watered down. Try dipping a paper towel and dabbing or wiping softly