Oscilloscope Waveform distills the look of mid-century analog test gear: a near-black CRT screen behind a glass faceplate, an etched internal graticule grid, and one electric trace glowing in P31 (ZnS:Cu) yellow-green phosphor light peaking near 531 nm. The bright excited trace reads as a high-contrast green against the black screen, with short-persistence bloom.

This is a strictly monochrome system. There is no color but phosphor green at varying intensity — the bright excited trace, the steady glow, the dim graticule lines — all against a black screen. The result is a precise, instrument-grade interface that feels measured, technical, and quietly luminous.