This product was acquired 20 years ago from a Japanese-style painting artist who passed away at the age of 100. The set of 3 items (net weight = 53g) are natural mineral pigments in test tubes, released by Kyoto Ebisya G材 in the early Showa era. 〇 Burnt Ultramarine 10g This is ultramarine (natural mineral pigment derived from azurite) that has been fired to change its color. Firing results in a slightly subdued blue or grayish-blue hue. Due to the additional processing steps involved, it is even rarer among natural ultramarines. 〇 Black Ultramarine (2 items, total 43g, large capacity) The natural black ultramarine in test tubes, released by the long-established Kyoto art supply store Ebisya in the early Showa era, is a deep, blue-black mineral pigment obtained by firing and refining ultramarine derived from azurite, and is of the highest quality. It was a highly prized, top-grade product in Japanese-style paintings of the time for expressing heavy shadows and a calm color tone. 〇 About this product (please refer to the photos) Burnt Ultramarine No. 13 has fine particles and a whitish-blue color. Black Ultramarine No. 8 has slightly larger particles, so it appears more black. Black Ultramarine No. 13 has fine particles, resulting in a light bluish color. 〇 Collector's Value It is not just ultramarine, but a rare pale blue ultramarine due to the firing process, making it highly valuable to collectors. 〇 Label Value The "Kyoto Ebisya" red double-line label bottles play a role in enhancing the value as a certificate and material for the store. ・ Red letters, red double-line label = early Showa era to the first half of the 1950s. ・ Black letters, red single-line label = the latter half of the 1950s to the 1960s and beyond. 〇 Bottles from the early to mid-Showa era They have very high "material value" in the collector's market. 〇 Test tube packaging: A small-portion sales format that was distributed in the early Showa era. It combined preservation and portability, allowing painters to purchase small amounts. 〇 Rarity Especially "White Ultramarine No. 10" and "Burnt Ultramarine" are rare items among natural ultramarines due to the added processing steps, and it is rare to find them with labels. The condition of "early Showa era, Ebisya label, test tube packaging" adds to its material value. There are almost no listings of a set of 3 items of "Black Ultramarine, Burnt Ultramarine" related to "natural ultramarine" from the Showa retro era, making it highly rare. The price is set considerably lower than the usual market price and collector's price. The photos and descriptions are all there is, so please examine them carefully before purchasing. The materials are based on AI market research.