Sertodo 25oz Pure Copper Cup | Hand-Hammered, Heavy-Gauge Copper Cups for Water, Cocktails & Moscow Mules | 100% Solid Drinking Tumbler

Perfect copper cup Remember to clean with lemon and salt to remove spots

Great cup

This cup is 100% copper and is not sealed so you receive the benefits of the copper. Because it is real, I did see dark spots on the cup after use called patina. It is a natural oxidation process that doesn't harm you that cleans up with lemon and salt.

Beautiful glass. No sharp edges. Thick. Received at 8 pm. Cleaned out. Went to bed. 8 am oxidized at edge of water level and all around bottom. Cleaned out with salt and lime. But now what? I thought the whole point of having copper was to let it sit and drink clean copper. The internet says don’t drink out of an oxidized glass. Will make you sick. Sending it back and getting a new one. Looks like you can’t use tap water. That’s what turned my cup black. Filtered water did not. Get my second one. Put water in it at bed time. Drink a couple time during nite. In morning glass is black. Washed with half of lemon and salt. Looks like I’m gonna have to do that, every time I use.

This is the best copper cup I've ever purchased, the quality of the cup, is incredible, everytime you hold it in your hand it feels like no other. The only problem I have is that, it doesn't come in a larger size, I have to refill it multiple times at one setting

Seems ok I thought it was made in the US also very rigged almost sharp drinking edge wish I had known that for the price not super happy

Beautiful! The cup is thick & nicely done. It will never break & last forever. I wanted something that would encourage me to drink more water, as I drink coffee all day long. This doesn’t really alter the taste but makes purified water seem more refreshing & crisp. Very happy with purchase.

I received my cup yesterday, I washed the cup as soon as it arrived, with warm water. I fill it with filtered water and ice. I let sit overnight to receive the reported copper health benefits. This morning there were green spots ant the bottom along the inside of the cup as well as a ring line where the water topped inside the cup that resembled green/bluish mold! I emptied the water and washed with salt and warm water as recommended. The green mold spots did not go away! Is this normal? Is it safe to drink from?