A.C.E. Chemical was a Processing Plant for chemical supplies and substances to be used elsewhere by it's parent company, Wayne Enterprises. The company was in primary competition with Kane Chemical, though were sent behind in the race after Philip Kane took over Wayne Enterprises. Nonetheless, the company did good until it was attacked by the Red Hood Gang and it had been exposed that the Joker was born in the plant. Following the Showdown at A.C.E. Chemical, the plant shut down and was only ever used by the Joker, who put Harley Quinn through the same accident as he. Joker continued to sporiadically use the abandoned plant from time to time.