Update docs/assignments/week09.md

docs/assignments/week09.md

@@ -78,6 +78,15 @@ Prepare this recipe [^1] by collecting the ingredients necessary, to be found in
 
 ## Leather mold
 
+Heat up the water at 80 degrees, put the leather into the water with bicarbonate untill the bubbles are out (leather absorbing the water). 
+WARNING: Be carefull to not leave the leather for too long otherwise it shrinks and burns. 
+
+Put the leather on a mold (that should have holes to leave air pass), malaxe it with your handsto give the shape. 
+
+
+
+Thiner leathers take the shape more easily. 
+
 
 ![describe what you see in this image](../images/week09/IMG_9595.jpg){ width=300 align=left}
 ![describe what you see in this image](../images/week09/IMG_9596.jpg){ width=300 align=right}