Update docs/assignments/week09.md

docs/assignments/week09.md

@@ -73,7 +73,7 @@ Prepare this recipe [^1] by collecting the ingredients necessary, to be found in
 
 	=== recipe bio-plastic
 
-	Pour the water into the pot and heat (no more than 60°) . Slowly add the gelatin, always mixing with the hand whisk. Add the glycerol and then the cinnamon. Cook for at least 10 minutes until the solution becomes viscous.	
+	Pour the water into the pot and heat (no more than 60°) . Slowly add the gelatin, always mixing with the hand whisk. Add the glycerol and then the cinnamon. Cook for at least 10 minutes until the solution becomes viscous. Cinnamon is used to ward off mold and it must be considered that it colors the bioresin light brown as well as leaving a pleasant spicy scent.
 
 ![describe what you see in this image](../images/week09/felt_manipulations_2.jpg)<br/>
 After its preparation  I immediately brushed the bioresin on the reinforcing material because it starts to gelatinize quite quickly.