Starting from a series of great instructables, especially this one, I hosted a shirt bleaching workshop with my 2D design of the Heart of Downtown. You can see that sculpture here.
Scroll down to read more about the process.
We start with the logo lasercut from butcher paper, ironed onto the shirt. The cardboard stops the bleach from bleeding to the back of the shirt and also keeps everything flat.
We were surprised that the bleach turned the shirt orange. It was a 2:1 bleach to water ratio and apparently black to orange is common in bleaching (source: a facebook response from my neighbor)
We learned that spraying far away and being patient for the bleach to react resulted in a starry effect that still had crisp lines. A quick dunk in cold water and a little hydrogen peroxide stopped the reaction and we were done!