How to stain bones with tea?

Does anyone know how to stain animal bones with tea? I’ve been searching everywhere and I can’t find anything. I’m going to start a new hobby which is putting animal bones together to create a skeleton also known as articulation. Anyways when I complete the skeleton I don’t want the bones to be super white so I want to learn how to stain the bones so they can look more natural. Also this question is more about actually putting the skeleton together but is it easier to wire the tail together or use glue?