I use watercolor crystals to add color to my tea-stained or rusted tea bags.
The Beauty of Brusho Crystal Watercolor Inks
Simple Techniques using Brusho Crystal Colours Part 2
3 Ways to Use Brusho Crystal Colours - Hop-A-Long Studio
Tea Bag Art: Texture Techniques with Crystal Neubauer - Cloth Paper Scissors
An Artist Decides Not to Waste Used Tea Bags and Turns Them Into Watercolor Paintings / Bright Side
Used Tea Bag Art - What a Beautiful Way to Recycle
Simple Techniques using Brusho Crystal Colours
Using Brusho Crystal Colours – Artistic Artifacts
How to use Brusho Crystals — Kerrie Woodhouse