This is a vintage chart titled "PURPLE AND GREEN-YELLOW CHART" from the Munsell Color System. It's a grid of 100 color squares arranged in a 10x10 pattern. The chart is designed to visually represent a range of colors, with each square representing a specific hue, value, and chroma. The chart has two scales: one along the vertical axis labeled "SCALE OF VALUES" ranging from 1 to 9, and another along the horizontal axis labeled "SCALE OF CHROMAS" ranging from N to 10. The colors transition from deep purples and greens on the left to yellow and lighter greens on the right. The value increases from dark shades at the bottom to lighter shades at the top. There is text at the top of the chart that reads "MUNSELL COLOR SYSTEM ATLAS COLOR CHARTS COPYRIGHT BY A.H. MUNSELL 1905-1906 PATENTED JUNE 25, 1906". There is also text at the bottom of the chart that provides a description of the chart and instructions for handling it. The chart is labeled "P" in the upper right corner. The overall impression is of a scientific and precise color reference tool.