Diy Gold Paint Formulation Test: Side-by-Side Swatches and Reflectivity Results
To evaluate how these homebrew recipes perform under real-world scrutiny, we prepared four distinct recipes on rigid archival boards. Each formulation was applied using a precision 50-micron film applicator to guarantee identical layer thickness across all samples.
Once dried for 72 hours at 21°C and 45% relative humidity, the samples underwent a swatch opacity comparison over black-and-white Leneta test charts. We then ran a standardized metallic reflectivity test by aiming a 5,000K high-CRI LED spotlight at a 45-degree angle, recording specular reflectance with a digital lux meter positioned at the opposing 45-degree angle.
| Formulation Setup | Pigment / Binder Blend | Single-Coat Opacity | Specular Lux (5000K) | Archival Risk Level |
|---|---|---|---|---|
| Formula A (Mica Glaze) | Mica (20µm) + Matte Acrylic (1:3) | 34% (Translucent) | 420 Lux | Zero (Chemically Inert) |
| Formula B (Fluid Mica) | Mica (20µm) + Gloss Fluid Acrylic (1:2) | 62% (Semi-Opaque) | 890 Lux | Zero (Chemically Inert) |
| Formula C (Classic Shell) | Bronze Flake + Gum Arabic (1:2) | 91% (Near Opaque) | 1,680 Lux | Moderate (Oxidizes if unsealed) |
| Formula D (Enamel Suspension) | Bronze Flake + Damar Varnish (1:1.5) | 98% (Total Blockout) | 2,450 Lux | High (Requires solvent seal) |
The optical readouts confirm practical workshop lore. Formula A, mixed into a standard matte medium, suffered massive photon scatter; matting agents (silica particles) settle over the mica platelets, diffusing light into a flat, chalky sheen.
Formula D generated nearly six times the direct bounce of Formula A. The solvent-based resin shrank tightly during evaporation, forcing the bronze particles into a dense, interlocking, plate-like mirror.
