A solar cooker can reach up to 150 degrees Celsius(300 degrees F). UV from the sun will kill bacteria as well -- if the milk is shallow enough for the UV to penetrate. Milk in a plastic bottle in the sun would get very hot -- just like leaving a kid in the car. The problem with these methods would be that over-heating can destroy many nutrients, destroy flavor, and cause curdling. The light would destroy certain nutrients as well and oxidize vitamins C and E and such causing dangerous free-radical development -- and especially oxidizing lipids to cause carcinogenous rancidity. If attempting to pasteurize donor milk in such a fashion, it would be best to protect the milk from direct light exposure and have a good idea of the temperature. Heating the water before adding formula would be very preferable, I imagine. *********************************************** To temporarily stop your subscription: set lactnet nomail To start it again: set lactnet mail (or digest) To unsubscribe: unsubscribe lactnet All commands go to [log in to unmask] The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(R) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html