Two days ago I dyed my hair and ended up with a result I did not like at all. Day before yesterday I redyed trying to change my shade <darker to lighter> Is it all right to dye my hair again in two days without melting or losing my hair? I'm trying to go from ash blonde to a very dark brown, and used low ammonia products in both cases.

I think you will spoil your hair that way.

If you color or chemically process your hair excessively, you will damage your hair. Going from blonde to brown may require more than one-process color. When your hair was bleached to blonde, it took out the red tones. If you use a brown hair color on blonde hair, it could result in a green cast. In order to have a decent brown color, you will need to put back the red tones in your hair by using a reddish color and then apply the brown color. I think you should get your hair professionally done.