Disclaimer: Of course you have to be careful and you REALLY should wear old clothes, gloves and eye protection when using bleach!
A couple of inexpensive black t-shirts, some stencils, liquid bleach, a spray mister and and a Clorox gel bleach pen. Much of it was done freehand. Feel free to ask questions in the comments section. This was a great demo, please join us for the next one. Wednesday Oct 7 It will be all about "Parallel Pens" See you there!