Update alginatenet.md

docs/files/recipes/alginatenet.md

@@ -32,6 +32,7 @@ Final form achieved after: 7 days
 	* the plasticizer that bonds with the alginate (makes it flexible). 
 * **Water - 200 ml/gr**
 	* to dissolve and mix the polymeer and plasticizer
+	* optional: use a (diluted) natural dye instead for a colored plastic
 * **Sunflower oil - 5 gr**
 	* filler to reduce shrinkage
 * **Yarn - cotton, 2 metres** 
@@ -59,6 +60,7 @@ Approx. 100 ml of calcium chloride 10% solution that can be used for any alginat
 
 1. **Preparation**
 	- Weigh your ingredients for the alginate plastic (alginate, glycerine, water) in a blender
+	- Optional: use a diluted natural dye instead of water in the same amount for a colored plastic.
 	- Leave the mixture overnight to allow the bubbles to come to the surface and pop.
  
 1. **Loom preparation**