if you mean without tanning or false tanning, there is no other way to darken your skin
Yes Salt can dry out your skin...or at least Salt Water can like the Ocean
yes?
UV rays transfer energy into the dead particles into your hair, lightening it, and since your skin isn't dead, it will darken it.
No, it is not harmful.
No
It is not recommended; after drying salt remain on the skin.
It's because the salt from the water stays on your skin, and the sun drys it out. So if you need to use lotion.
Your skin gets wet and salty
No. A sauna is (in simple terms) a steam bath. In order for your skin to darken, the melanin in your body needs to react with ultra-violet light.
Salt water is great for acne. You could cleanse your skin with salt water at the beach or you can make salt water at home. All you need to do is mix a few tablespoons of salt into your bath. (I'd prefer using sea salt.) The salt may sting a bit, but that's normal. When your done, moisturize a bit with lotion so you won't dry your skin. If you have sensitive skin, I recommend you don't try this technique.
When you soak in salt water, the osmotic pressure draws water out of your skin cells, which may temporarily reduce the appearance of wrinkles. This effect is not permanent, and prolonged exposure to salt water can actually dehydrate the skin and lead to increased wrinkle formation over time.