Study how to create film burn in After Effects

Today I started to study Film burn in After Effects, which I want to use in my test clips. I really love this effect, because it looks bright and colourful and it also can link different shots with a soft way. However, some people think this effect looks too over in a short film that they will jump out of the story. But I think it depends on the story. When we need to create something dreamlike or fantasy, this effect will be very useful can let audience have that feeling. And I also download some clips and try to create what feeling i want.