The first 1 / 4 time, moderate reaction; strong response in the middle of a period of time, emit large amounts of brown smoke, there is a slight boil and splash phenomenon; in the post 1 / 4 time reaction is slowed down, bright flame, smoke slowed, the reaction at the end of there was light.

Make this lower case.
the first 1 / 4 time, moderate reaction; strong response in the middle of a period of time, emit large amounts of brown smoke, there is a slight boil and splash phenomenon; in the post 1 / 4 time reaction is slowed down, bright flame, smoke slowed, the reaction at the end of there was light.