Glass
Soda Ash, also known as crude sodium carbonate, is slightly harder to find.  There are a few more steps involved in obtaining pure soda ash.  This ingredient gets its name from the fact that you can get soda ash from the ashes of certain sea plants such a saltwort.  Saltwort (Batis maritima) is easily found around the rims of bays and marshes where its roots are washed at high tide.  To obtain the soda ash, place the saltwort root and stem in a small container to catch the ashes, and burn the plant.  These ashes are now soda ash.

Saltwort-image 1

And finally, pure sand is simple to find on any beach.

According to both the Handbook of Chemistry and Physics, and http://class.et.byu.edu/hond241-001/glass.htm (a BYU web link), we need 75% sand, 15% soda ash, and 10% Calcium carbonate.  That translates to about 75 parts sand to 20 parts soda ash to 15 parts calcium carbonate.  You can make as much glass as necessary as long as these measurements stay the same.

In order to heat this mixture of ingredients, and also to obtain the calcium carbonate (remember we have to heat the limestone), we need both a stove or furnace (Lauren's part), and a source of heat.  Wood does not get hot enough, and charcoal is very simple to make.  All you need is a heat safe container, a large rock to serve as a lid, kindling, charred wood from a previous fire, some dry grass, and some small, supple tree branches.   

 

 

Step 1: Charcoal-image 2

 

 

 

Put all of these ingredients minus the tree braches in your container, and light. 

Step 2:Charcoal-image 3

 

 

 

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