A hydrocarbon-containing mixture including acetylene and butenyne is disclosed. The hydrocarbon-containing mixture can include 10% to 89% acetylene, 10% to 89% butenyne, and at least 0.25% dimethyl butadiyne. A method and system for producing the hydrocarbon-containing mixture is also disclosed. The system can include an acetylene production subsystem comprising at least one vessel and an acetylene output for delivering acetylene to a finishing vessel via a finishing vessel inlet. The finishing vessel can include a diffuser in fluid communication with the finishing vessel inlet, and gas exiting the diffuser can pass through a reaction chamber filled with solid calcium carbide before passing through a finishing vessel outlet.