I find that a cheap flat-black spray paint works
just fine. Scrape off a vertical stripe so that you have a
clear glass "window" to look into the vessel, to check the food
or water for boiling.
7. A block of wood is used as an insulator under the jar. I use
a piece of 2"X4" board which is cut into a square nominally 4"
x 4" by about 2" thick. (10cm square x 5cm thick.) One square
piece of wood makes a great insulator.
8. A plastic bag is used to go around the cooking-jar and block
of wood, to provide a green-house effect. Suggestions:
-Reynolds" Oven Bag, Regular Size works great: transparent
and won't melt. (Cost about 25 cents each in U.S. grocery
stores.)
-Any nearly-transparent HDPE bag (High-density Polyethylene).
Look for "HDPE" stamped on the bag. I've tested HDPE
bags which I picked up for free at my grocery store, used
for holding vegetables and fruits. These are thin, but
very inexpensive. Tested side-by-side with an oven bag
in two solar funnels, the HDPE bag worked just as well!
(Caution: we have found that some HDPE bags will melt
should they contact the hot cooking vessel.
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