Am I just over thinking this...or would this make a difference.... I am making a reasonably natural Mosquito lotion with Vanillin. Oxidation is very much a consideration, and am working on the formula to include some anti-oxidants to address this. I live in Hawaii...so all my costs are higher than yours. Therefore I wanted to try and get by with a flip-top lotion dispensing top. However, it occurred to me that maybe a pump would be more appropriate for minimizing the air exchange. I realize that even with a pump...a vacuum in not created within the bottle....but I do think that the air exchange would be minimized?
Love to hear your thoughts.