You need 5 things: Water, bleach, ductape, spraybottle and a black shirt.
Create a design with ductape on your t-shirt, you can cut some thinner straws, place ductape next to each other to make a bigger strand. The areas where you put the ducktape will stay black. Pour some water in the bottle and mix it with the bleach. The more bleach you use, the more concentrated it will come on your shirt.
Make sure you're in a airy area, for example outside, because you don't want to keep the smell of bleach in your room. And yes then... spray away! Don't spray everything in once but create layers for the best results.
* If you use a big black shirt you can also cut out a new design.
