The platinum necklace is black. What is the best way to wash?

I think the first method: buy a pack of developing powder from the photographic equipment store, mix it with clean glassware and 1kg water after going home, stir it evenly, soak the jewelry in it, take it out in about 5- 10 minutes, rinse it with water, and then wipe it with a dry cloth to make it bright. The second method is to take 2 grams of salt, 7 grams of baking soda, 8 grams of bleaching powder, and 60 ml of clear water. After stirring evenly, put the jewelry in, soak it for about two hours, take it out, rinse it with clear water, and dry it with a cloth. It will be much brighter. K maintenance of platinum necklace platinum necklace will be contaminated with dust if worn for a long time. Generally, the cleaning method is to buy a pack of developing powder from the photographic equipment store, put one kilogram of clear water on the clean glassware after going home, stir it evenly, soak the jewelry in, take it out after about 5- 10 minutes, rinse it with clear water, and then wipe it with a dry cloth to make it bright. Another way is to take 2 grams of salt, 7 grams of baking soda, 8 grams of bleaching powder and 60 ml of clear water, stir them evenly, put the jewelry in, soak it for about two hours, take it out, rinse it with clear water again, and dry it with a cloth, which will be much brighter. How to clean platinum jewelry with platinum necklace at home: immerse platinum in jewelry cleaning solution for 5 minutes, then put it on the filter screen and wash it with water, and then use soft cloth to absorb water, once a month/kloc-0. When doing housework, don't let platinum jewelry be stained with oil or bleach. Because bleaching water will cause spots on platinum, and it is more troublesome to remove; Don't wear platinum to do heavy work, platinum will also deform under strong external force; Platinum can't be matched with gold jewelry because gold is soft. If they rub against each other, it will not only damage gold jewelry, but also make gold dye on platinum, turning yellow and difficult to remove. You can also take it to the jewelry counter. They all use special ultrasonic waves to clean. It's bright after washing. Wash it as long as it doesn't feel bright! The effect is obvious ~ ~ In addition, you can do it yourself: 1. Detergents usually used for washing dishes and fruits are very economical platinum jewelry detergents after being diluted with water. 2. Buy a pack of developing powder from a photographic equipment store, put a small amount into a clean glassware, add water and stir evenly, then soak the platinum jewelry in it for 5~ 10 minutes, then take it out, rinse it with water and wipe it with a dry cloth, and the beloved platinum jewelry will be as bright as new. Wrap the necklace with toothpaste, wait for an hour or two, and then wash it with hot water when the toothpaste is dry, which can make the necklace as bright as new.