What specific technique involving reflective material can be used on a grey day with a glass jar to maximize thermal absorption?

Answer

Wrapping the lower half in aluminum foil

For those attempting to brew outdoors despite heavy cloud cover, maximizing the capture of available, scattered solar energy becomes essential, especially when using traditional clear glass containers. Clear glass allows thermal energy to escape through its sides. To counteract this loss and increase the internal temperature slightly, a method inspired by solar oven principles can be employed. This involves strategically wrapping the lower portion of the glass pitcher in aluminum foil. This reflective material serves to trap and redirect whatever limited solar radiation strikes the container back inward toward the water, thereby increasing thermal retention and potentially boosting the internal temperature enough to exit the bacterial risk zone during peak daytime hours.

What specific technique involving reflective material can be used on a grey day with a glass jar to maximize thermal absorption?

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