How does colloidal Coomassie work?

Colloidal Coomassie is a variation of traditional Coomassie staining that uses a modified Coomassie dye, specifically G-250 instead of R-250. Since the colloidal dye doesn't penetrate the gel, there's no requirement for destaining. However, destaining can be done to enhance the contrast between the protein bands and the background. Colloidal Coomassie stains can be prepared to stain proteins effectively within 1 hour and only need water for the process.