But see, here's why your question is above my paygrade (which is none). I wish someone else had chimed in, but nobody has. Here's my difficulty, and why I think anyone would have difficulty -- you're trying to supplement a large dose of potassium when it's plentiful in a range of very healthful foods.
Tinting of front windshield glass to reduce light transmission is not permitted, except for the upper 6 inches of the windshield. For side windows or rear windshield, glass tinting that reduces light transmission to less than 32% or increases light reflectance to more than 20% is not permitted. For SUVs, vans and trucks, the limit is 32% for the driverâs window and the front passenger window only.
Legality of Window Tinting. Each state has its own laws about window tinting. There are regulations about colors of tinting, light transmission, and reflectivity, as well as which windows can be tinted. To decide which type of tint is best for your car, it's essential that you know the law in your area.