First, read the English article below.

Before you bleach your hair you’ll need to do a patch test and a strand test. A patch test will ensure that you’re not allergic to anything in the bleach mixture, and a strand test will help you determine how long to leave the mixture in.  To do a patch test, create a tiny amount of the mixture you will use on your hair and place a small dab of it behind your ear. Leave it for 30 minutes, wipe any excess off, then try not to touch it or get it wet for 48 hours. If after 48 hours that area of skin is fine, go ahead with bleaching your hair. To do a strand test, prepare a small amount of the bleach mixture and apply it to a strand of your hair. Check it every 5 to 10 minutes until it reaches the desired color. Note the time it took to reach this color so that you have an idea of how long it will take on your whole head. Another thing to pay attention to in the strand test is how damaged the hair feels after you've washed and conditioned the strand. If it feels very damaged, try a lower-volume developer or a slower bleaching process (i.e. bleaching your hair over several weeks instead of in one go).  If you only do one test, do the patch test, as a severe allergic reaction could be fatal. Put on old clothes that you don't mind getting stained. Drape a towel around your shoulders, and have another stack of towels ready in case the bleach mixture gets somewhere it shouldn’t. Put on a pair of gloves to protect your hands. Gloves are very important when bleaching hair to prevent chemical burns. Using a plastic spoon, place as much bleach powder as you need in the mixing bowl. The powder should come with instructions that you can follow. If it doesn’t, you’ll want to use roughly a 1:1 ratio between the powder and its developer. You may want to do one scoop of powder and then one scoop of developer, mixing them as you go. Add the correct amount of developer and mix it with a plastic spoon. Aim for a thick, creamy gravy consistency. Unless stated otherwise on the packaging, the ratio of developer to powder should be... 

Now, please write a short abstract for it in Chinese. Abstract:
先做初步测试。 做好准备。 把漂白粉倒进搅拌碗。 拌入显色剂。 加入红金色中和剂。 将混好的漂白剂涂到还没洗的干发上。 确保漂白剂分布均匀。 用塑料膜裹着头发。 定时检查头发。 不要让漂白剂在头发上待超过50分钟。 洗掉漂白剂。