Because the people using the old solution aren't the ones buying it. A chem lab is going to be stocked with the equipment everyone used in chem school, and the

Because the people using the old solution aren't the ones buying it. A chem lab is going to be stocked with the equipment everyone used in chem school, and the people who went to chem school are going to require that equipment. Yes, it'd trivial to change processes to use this new solution, but every chem lab in existence already has a thermometer and a hot plate with stirring, so the expense makes very little sens on its own.