The reason your skin turns green when you wear copper is because of a naturally occurring copper acetate called verdigris which interacts with your skin and acid.
The verdigris forms when acid and copper react together causing the green color.
The health benefits of wearing copper is that the copper is supposed to improve blood flow, improve cardiovascular function, improve neuron signaling, improve immune system function, improved and higher bone mineral density, increased collagen production and a reduction in free radical production.
However the copper has no scientific proven evidence that the copper actually works.
Magnetic bracelets are better than copper although even the magnetic bracelets do not really work as they are advertised.
Magnetic bracelets and copper bracelets do not work on stiffness or arthritis.
Copper bracelets and copper gloves or other copper Jewellery do not really have any health benefits and actually do not do anything to help improve health, pain, arthritis etc.
Wearing a copper bracelet or other copper around your wrist is supposed to help with inflammation, pains and aches and it's supposed to do this by transmitting tiny particles of copper through your skin.
It's basically magnetic therapy that's supposed to work through the magnetic field of the body.
In reality though the copper bracelets have no actual effect on the human body although some people believe they do but it's nothing more than a placebo effect.
Wearing a copper bracelet or wearing copper gloves does not help with pain.
Some people say that the pain goes away with wearing the copper bracelet or copper gloves but it's simply a placebo effect and nothing more.
Copper gloves do not really help with arthritis or pain and gloves with copper filaments do nothing to really give relief from arthritis or pain in any other way other than the placebo effect.
I've worn copper gloves and they never helped my arthritis or pain at all.