The message below to my email address is a perfect example of why web page owners should let people peruse before being required to join a forum.

Here is the indicator you mentioned -

<http://solarcookers.org/order/cookers.html>

wapi Water Pasteurization Indicator (WAPI)

Disease-causing organisms in water and milk are killed by exposure to heat in a
process known as pasteurization. Water heated to 65°C (149°F) for a
short period of time is free from microbes, including E. coli, Rotaviruses,
Giardia and the Hepatitis A virus.

The reusable, durable WAPI is a simple device containing a special soy wax that
helps users determine when water has reached pasteurization temperatures. The
WAPI can be used for pasteurizing over most fuel sources — including wood,
charcoal and gas — but it works particularly well in conjunction with a solar
cooker. Great for camping and emergencies. WAP
$6.00

Jeff
Just a web_surfer passing through the
'Equipped to Survive' forum...

Thank you Jeff!

Bountyhunter