Solvent Mixture Bottle (Polly Cocktail)

The bottle from the fire extinguisher is emptied by Ben and refilled with the 'Polly cocktail,' becoming the container for the volatile solvent mixture. Polly measures the chemicals precisely, ensuring the correct proportions, while Ben grips the bottle firmly, ready to attach it to the extinguisher cylinder. This bottle is the vessel that holds the group's hopes for neutralizing the Cybermen, its contents a fragile but potent weapon. The act of refilling it underscores the urgency and precision required to turn everyday objects into tools of survival.

The bottle (part of the fire extinguisher) is the container for the 'Polly cocktail,' serving as the intermediate step between the loose chemicals and the pressurized weapon. Polly has already filled it with the solvent mixture, and Ben attaches it to the extinguisher’s cylinder, completing the modification. The bottle’s role is practical but pivotal: without it, the solvent would lack the necessary pressure to spray effectively. Its involvement highlights the team’s improvisational genius—using everyday objects to counter an existential threat. However, the tension between Ben and Jamie casts a shadow over this achievement: the bottle, like the extinguisher itself, becomes a symbol of what they could accomplish if they worked together—and what they lose when they don’t.

The 'Polly cocktail'—a volatile solvent mixture of benzene, ether, alcohol, acetone, and epoxy-propane—is the weapon that turns the tide of the battle. Ben and Polly refilled a fire extinguisher bottle with this mixture, creating a spray weapon specifically designed to target the Cybermen's plastic chest units. During the ambush, they use the bottle to spray the solvent directly at the Cybermen, causing their chest units to bubble, corrode, and dissolve. This improvised weapon proves critical in disabling the Cybermen and freeing the mind-controlled humans.

The 'Polly cocktail' (a benzene, ether, alcohol, acetone, and epoxy-propane mixture) is referenced indirectly as the weapon that dissolved the Cybermen's chest units, leading to their defeat. Though it is not used in this specific event, its presence is felt through the incapacitated Cybermen and the freed crewmen. The cocktail symbolizes the companions' resourcefulness and their ability to turn everyday materials into effective weapons, a theme that contrasts with Hobson's reliance on institutional machinery like the Gravitron.