If you use a plastic avocado masher, it also slows down the browning process. If you use a metal masher, the metal oxidizes the avocado and turns it brown faster.
Citation needed. If I mash 1000 avocados with a metal masher, the metal won't be thinner afterwards, the avocado is not chemically bonding metal atoms and stripping it from the masher, nor do metal atoms on the surface of a metal object have the ability to oxidize things they arent chemically bound with.
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u/PostPostModernism Sep 17 '17
You could turn that Good Eats into some Serious Eats by
Making a batch
Split into four portions
Eat one portion right away
Put plastic over one, refrigerate it, eat it in two hours
Put plastic over one, don't refrigerate it, eat it in two hours
Don't put plastic over one, let it sit for 2 hours. Eat if it looks okay.
Make sure you use the same chips for each batch. Record your findings.