update bioresin

docs/files/recipes/bioresin.md

@@ -32,6 +32,7 @@ Final form achieved after: 10 days
 	* Functions as plasticizer that bonds with the gelatine (makes it flexible). 
 * **Water - 480 ml/gr**
 	* To dissolve and mix the polymeer and plasticizer
+* **A large round coffee filter** to absorb froth
 
 ## Tools
 
@@ -62,8 +63,9 @@ Approx. 300 ml (make sure to evaporate a lot of water during cooking time)
 
 1. **Cooking the ingredients**
 
-	- 	Simmer and slowly stir the mixture between 60-80 degrees celcius for at least 20 minutes or up to an hour. Turn it lower when bubbles appear: you don't want the liquid to move, don't boil it. This sample has some bubbles due to vigorous mixing.
-	-  Longer cooking time allows more water to evaporate. You will get a thicker liquid. To cast larger volumes and solids with this recipe, evaporate a lot of water, until it's very thick.
+	- 	Simmer and slowly stir the mixture between 60-80 degrees celcius for at least 20 minutes or up to an hour. Turn it lower when bubbles appear: you don't want the liquid to move, don't boil it. 
+	-  Longer cooking time allows more water to evaporate. You will get a thicker liquid. To cast larger volumes and solids with this recipe, evaporate a lot of water, until it's very thick. Sometimes it's worth reheating and melting scraps, they've already dissipated a lot of water and result in nice castings.
+	-  If froth appears on top of your liquid and doesn't go away, you can use a coffee filter to absorb it by covering the surface with it and then taking it off. In cooking this is called a *cartouche*, you can also make one from kitchen paper. Take a round coffee filter that fits into your pot. Absorb additional froth using some kitchen paper. 
 	
 1. **Casting**
 
@@ -78,12 +80,12 @@ Approx. 300 ml (make sure to evaporate a lot of water during cooking time)
 ### Drying/curing/growth process
 
 - Mold depth:  				 7 cm (filled up until 2.5cm high)
-- Shrinkage thickness:      20-30 %
-- Shrinkage width/length:   20-30 %
+- Shrinkage thickness:      10-20 %
+- Shrinkage width/length:   10-20 %
 
 **Shrinkage and deformation control**
 
-Letting it dry up to ten days to get to the final form. It will be flexible at first but will slowly harden until its totally rigid.
+Letting it dry up to ten days to get to the final form. It will be flexible at first but will slowly harden until its totally rigid. 
 
 **Curing agents and release agents**
 
@@ -106,7 +108,15 @@ The resin does not cure evenly across the surface, some might be negotiated by s
 
 ### Process
 
-![](../../images/resin5a.jpg)*Evaporating water until the liquid is thick like honey, Loes Bogers, 2020*
+![](../../images/resin_froth4.jpg)*Getting everything ready, Loes Bogers, 2020*
+
+![](../../images/resin_froth3.jpg)*A lot of froth appearing on this batch, Loes Bogers, 2020*
+
+![](../../images/resin_froth2.jpg)*Absorb it by covering the surface with a coffee filter for a few seconds, Loes Bogers, 2020*
+
+![](../../images/resin_froth1.jpg)*Getting the last frothy blobs out with some kitchen paper, Loes Bogers, 2020*
+
+![](../../images/resin5a.jpg)*Evaporating water until the liquid is thick like honey (I separated the batches to speed this up), Loes Bogers, 2020*
 
 ![](../../images/resin5.jpg)*Preparing molds for small half domes (egg cups), and a big slab (silicon mould and separate base), Loes Bogers, 2020*
 

docs/files/recipes/biorubber.md

@@ -4,9 +4,11 @@
 
 <iframe width="560" height="315" src="https://www.youtube.com/embed/xTVABD1KlsY" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 
+**>> update video <<**
+
 ### Description
 
-A rubbery biopolymer based on gelatin and corn starch.
+A rubbery bioplastic based on gelatin and potato starch.
 
 ### Physical form
 
@@ -26,16 +28,16 @@ Final form achieved after:7 days
 
 ## Ingredients
 
-* **Gelatine powder - 50 gr**
+* **Gelatine powder - 50 g **
 	* Functions as polymeer (so it becomes a solid)
-* **Corn starch - 50 gr**
+* **Potato starch - 50 g **
      * Functions as the second polymeer (so it becomes a solid)
-* **Glycerine - 50 gr**
+* **Glycerine - 100 g **
 	* Functions as plasticizer that bonds with the gelatine (makes it flexible). 
-* **Water - 50 ml/gr and a dash extra**
+* **Water - 100 ml/gr and a dash extra**
 	* To dissolve and mix the polymeer and plasticizer
 	* To dissolve and mix the corn starch before adding to the other liquid
-* **White vinegar - 15 ml**
+* **White vinegar - 15 g **
 	* Vinegar is almost always added to starch-based biopolymers to change the molecular structure of the starch, making it stronger and more workable.
 
 ## Tools
@@ -133,8 +135,9 @@ Not sure.
 
 ## Variations on this recipe
 
-- Add a **natural colorant** such as a vegetable dye or water-based ink (e.g. hibiscus, beetroot, madder)
-- Add **more glycerine** for a more flexible slab (up to 100 g)
+- Add a **natural colorant** such as a vegetable dye or water-based ink (e.g. hibiscus, beetroot, madder). The vinegar makes this recipe acidic so keep that in mind when using PH sensitive dyes. 
+- Add a natural scent to mask the acidic smell of the vinegar. 
+- Add **less glycerine** for a more rigid slab (50/50 polymers and plasticizers is considered the max)
 - Reduce amount of gelatine or leave it out altogether
 - **Stiffeners** such as fibres, yarn or natural debris may be added for more structure and reinforcement.