**Brush movement and color decay – Position F (Starry Night vs. Tree Oil)**
Position F presents a sweeping blue curved stroke from *The Starry Night* (1889) and a matching stroke in the Tree Oil Painting. The gesture and curvature are consistent, though the color from the Tree Oil appears faded. Analysis suggests that this area may have once contained a purple tone (from red and blue) but the red pigment is now absent, likely due to “flying colors” — a term for pigment instability over time. The remaining blue-white trace aligns with Van Gogh’s brush behavior.

🎨 *Observation: consistent movement with partial pigment loss (possibly purple once present).*