Regarding the four green colors: The early Showa era Ebisya test tube-encased "Matsuba Ryokushō (Pine Green), Kimidori Ryokushō (Yellow-Green), and Seichamidorii (Blue-Brown Green) (No. 11, No. 15)" are all green rock pigments obtained by crushing and water-separating natural green copper (malachite). In the early Showa era, Ebisya sold natural rock pigments sealed in test tubes with red-framed white labels. Therefore, test tube packaging is a sign of natural origin and has very high value as a historical material. 〇 Matsuba Ryokushō (Pine Green) No. 13, 6.82g Ranking in the middle to upper range among the green copper pigments within the ultramarine family, it is a slightly bluish deep green. It is ideal for the trees, moss, and deep green clothing in landscape paintings. It has a calm green like pine needles, darker than Hakuryoku (White Green), and slightly bluer than Gunroku (a type of green pigment). 〇 Kimidori Ryokushō (Yellow-Green) No. 13, 11.34g Among the green copper pigments, it is a bright green with a yellowish tint, close to the color of young leaves. It is more yellowish than Hakuryoku and brighter than Matsuba Ryokushō. It is often used for plants, clothing, and the green parts of objects exposed to light. It is a mid-range price among the green copper pigments. 〇 Seichamidorii (Blue-Brown Green) No. 11, 9.57g, No. 15, 8.65g Among the green copper pigments, it is a deep, subdued green mixed with blue and brown (ocher), a complex color of "blue-green + brown." It is even more subdued than Matsuba Ryokushō and has a sense of weight. Total: 36g Features of this product: Natural green copper's color is determined by "layer differences" rather than "particle size = color depth." → When natural green copper (malachite) is water-separated: - Heavy particles (settle quickly) = dark color layer - Light particles (settle slowly) = light color layer In the early Showa era, Ebisya prioritized the "shades of these layers" when assigning numbers, so: → No. 11 is the dark color layer (deep green) → No. 15 is the light color layer (bright green) 〇 The labels of Kyoto Ebisya Gazyai at the time had a double red line frame on a white background, and names were handwritten or printed on them. The label of this product has "No. 11" and "rock" printed on it, and "Black Ultramarine" is handwritten. * This product was acquired from a deceased Japanese painter who passed away 20 years ago at the age of 100. Especially, the natural rock pigments in test tubes from that time have antique value and are sometimes traded at high prices as research materials or collector's items. (From AI research data) The photos and explanations are all there, so please verify them thoroughly and we look forward to your purchase.