What's the difference between the effect of alcohol in the test of fat in biological tissue and the observation of mitosis in plant cells~

What's the difference between the effect of alcohol in the test of fat in biological tissue and the observation of mitosis in plant cells~

The former: wash floating color, avoid excessive dye influence observation
The latter: dissociation, the main purpose is to separate the cells, easy to disperse in the later operation, but also kill the cells