Stained Behind Closed Doors

The next afternoon, three hardware store bags sat on John’s garage workbench. He laid out the components under the bright LED shop light: a wooden trap, a plastic bottle of purple dye, glycerin from the pharmacy, a thin capsule, and a coil spring.

He cleared the workbench, pushed back his toolboxes, and taped down a sheet of white poster board to catch any spills. The blue garage door remained pulled tight against the street.

He mixed four ounces of the violet liquid in a glass beaker. The mixture was thick, dark, and oily. He loaded the fluid into the modified canister, set the hair-trigger pin, and smoothed a piece of gray duct tape across the seal.

His hands were steady as he reached down to set the wire. It was time for the first test.

The spring snapped before the lid even reached forty-five degrees.

A sharp crack echoed through the garage, followed by a wet splat. John flinched, but he was too slow. Violet liquid misted across his workbench, dripping off the edge of the plywood onto the concrete floor and soaking straight into his right forearm.

“Dammit,” he said, grabbing a shop towel.

He wiped at his skin, then scrubbed under the slop sink with dish soap and pumice powder. The flesh turned raw red, but the deep purple stain stayed put, painted from wrist to elbow like a dark sleeve. The liquid felt sticky, smelling faintly of sulfur and copper.

John checked his arm under the garage light. He had three days before his next shift at work, which meant long sleeves in ninety-degree heat. Still, the test proved two facts: Brian’s dye recipe worked, and the pressure trigger was far too loose.

He spent the afternoon recalibrating the tension mechanism in his vise. Instead of releasing on simple contact, he built a dual-latch trigger beneath a cardboard tray. Bumping the box wouldn’t set it off. Dropping it on the driveway wouldn’t set it off. Only lifting the package by its side edges would release the compressed arm, driving two steel pins into the twin dye packs.

To test the new latch, John dropped a socket set onto the closed lid. Nothing happened. He tilted the box side to side. Silence. Then he slipped his fingers under the edges and lifted three inches.

A sharp clack vibrated through the cardboard. No early spray. Just instant, hard pressure from the internal spring.

He loaded two fresh purple capsules into the frame, wiping the outer casing with rubbing alcohol to clear any stray pigment. Inside the box, he taped down a brick to mimic a normal twelve-pound weight. He sealed the top with clear packing tape, angling the fake address label slightly off-center to look like an authentic delivery.