Phenol red is a pH indicator. You can use either product to dissociate your cells. When you use TrypLE Express enzyme to dissociate cells, they very likely become single cells. If you want to passage cells as clumps, you may consider using other reagents such as EDTA. Find additional tips...
The expression usually carries connotations of being badgered or harassed, as in the following bit of doggerel by F. Egerton. We were scarcely wed a week When she put me through my facings.And walloped me—and worse; She said I did not want a wife, I ought to have had a nurse. put...