Update file week04.md

docs/assignments/week04.md

@@ -190,8 +190,17 @@ Dutch Wool | Animal Fiber | High| High | High | Medium | < 30°C
 
 ## **Pigment**
 
+To not waste any dye we created pigments from the dye baths.
+
 ![dye](../images/week04/48.jpg){ width=1000}
 
+Steps:
+
+1. For 1 liter of pigmented water we add 15 grams and alum. Stir until everything is dissolved
+2. Add a little bit of soda until the pigmented water doesn't created more bubbles. Don't add too much of soda in one go to avoid a volcanic eruption!
+3. Prepare an empty jar, coffie filter and a sieve to filter out all the water
+4. Once all the water is filtered, your pigment is ready:)
+
 
 _Tools_