The description of Holmes after the attack, given by police detective Craig Appel, seemed to conflict with prosecutors' attempts to show Holmes as methodical, spending two months to assemble his arsenal.
The first recorded purchase: two tear gas grenades, ordered online May 10.
Holmes also bought two Glock handguns, a shotgun and an AR-15 rifle, along with 6,295 rounds of ammunition, targets, body armor and chemicals, prosecutors said.
He dyed his hair bright orange, then bought a scope and non-firing dummy bullets on July 1, the visit and the new hair color documented in security video.
Finally, he purchased glycerin and potassium permanganate — chemicals that could combine to create fire and sparks — from a science store. At some point, he also improvised napalm, as well as thermite, a substance which burns so hot that water can't extinguish the blaze.
Holmes' purchases were split between two planned attacks, prosecutors said — the theater shooting and a booby trapped apartment that would've blown up if anyone had entered.
The bottle of glycerin was meant to fall into the permanganate when the door to his apartment opened, to cause an explosion and then a fire, prosecutors said.
The manager of The Science Company, Steve Grebe, confirmed the purchase, noting the amount was small and the materials are common in junior high experiments.
The setup in Holmes' apartment had deadly potential, though. Parts of Holmes' carpet were soaked with gasoline and oil and ammonium chloride, a white powder, was poured onto the floor in strips, FBI bomb technician Garrett Gumbinner said.
"It would have ignited and the whole apartment would have exploded or caught fire," Gumbinner said.