Lightfastness
ISO 105-B02Structural finish: no measurable hue shift after accelerated UV exposure. Conventional fugitive dyes: visible fade in the same chamber.
THIN-FILM INTERFERENCE
Color is not in the material. It is in the light.
A film thinner than a wavelength turns reflection into selection.
When light meets a transparent film a few hundred nanometers thick, it reflects twice: once from the top surface, once from the bottom. The two reflected waves travel paths of slightly different length and recombine.
Where the path difference aligns the waves crest to crest, that wavelength is reinforced. Where it sets them crest to trough, that wavelength is cancelled. The film does not absorb anything. It reweights the spectrum it returns to your eye.
This is the same physics that colors a soap bubble, an oil sheen, and the shell of a jewel beetle. NACRE does it on purpose, to a tolerance, on a substrate of our choosing.
PHX-001 MATERIAL Dielectric thin film on polished substrate REFLECTION MECHANISM Two-surface interference, zero absorptive pigment
Thickness chooses the color.
Tune the layer in nanometers; the reflected peak wavelength follows.
- 470 nm peak 90 nm film → deep blue
- 525 nm peak 120 nm film → green
- 590 nm peak 150 nm film → amber-gold
- 650 nm peak 185 nm film → red
WAVELENGTH → sRGB
From peak wavelength to a color you can name.
A reflected peak at 525 nm is a physical fact. "Green" is a perceptual one. The bridge between them is the eye's response, integrated through the CIE color-matching functions and projected into the sRGB gamut.
We characterize every finish by its measured reflectance spectrum, not by a swatch. The curve below each specimen is the ground truth; the rendered color is its honest projection onto a display. Because the hue is set by viewing geometry, we publish it at a fixed angle: 8 degrees from normal, D65 illuminant.
Read left to right, the spectrum is the maker's drawing. The color is only how it looks when you stand in front of it.
Nothing in here can fade.
A pigment is a molecule that absorbs. Absorption is what eventually breaks.
Colorant content
by massZero pigment, zero dye. The color is the layer geometry; the layer is transparent dielectric.
Restricted substances
REACH / RoHSNo heavy-metal pigments, no azo colorants. Nothing to migrate out of the surface.
< 1 ΔE Hue shift, 1000 h accelerated UV
0 % Pigment by mass
≈ 0.0001 mm Color-bearing layer thickness