Hapa zome is a Japanese fabric printing technique that uses the natural pigments found in plant leaves and flowers. The results are beautiful, but temporary - over time, the colors will fade to taupe and definitely won't survive a wash. To make the hapa zome print permanent, the fabric can be mordanted before use - this involves simmering the fabric in a solution, rinsing, and drying. While there are many different ways to mordant fabric, one of the simplest is to use soy milk. To start, mix a liter of soy milk into 5 liters of cold water. Then, wash your fabric in the washing machine and let it dry naturally. Next, soak the fabric in the milk mixture for 24 hours. After that, spin off the milk in the washing machine and let the fabric dry naturally. Finally, place the fabric back into the milk mixture and repeat this process around three times. After a few days, try hapa zome following the above instructions. Finally, fix with an iron and wait as long as possible before washing. By following these steps, you can easily mordant your fabric using soy milk.