In Fin-de-Siècle Paris, the laboratory revolution was powered by an ideology comparable to the Dreyfus case: a determination for military revenge against Germany. Hence the need to beat the Germans at their own game, excellence in chemical science and technology. While the French state instituted faculties of sciences in both Paris and the provinces, commercial suppliers sprouted in Paris to provide laboratory equipment, glassware, and chemicals. They also fed upon the contemporary rise of photography. The French government established the Laboratoire municipal de chimie in Paris with the mission of making food and drink safe for Parisians. This chapter focuses on some leading commercial suppliers with shops in the Latin Quarter, conveniently close to their laboratory clients at the Sorbonne.