The history of wooden individually “cut-out gold letter” signage in Japan was discussed from the literature. It was inferred that the original type of “cut-out gold letter” signage was “carved letters ”signage with gold leaf on a single sawn wood (mainly Zelkova serrata), which had existed as a signboard for apothecaries since the early Edoperiod (late 1600s). Various types of signboards appeared with the development of commerce from the Edo period through the Meiji, Taisho, and Showa periods, and it is believed that the “cut-out gold letters” signboard spread widely because of the change in architectural styles that accompanied the reconstruction following the Great Kanto Earthquake in 1923. The newly appeared architectural style is so called “Signboard building”, because it was characterized by the decorated front facade covered with fire-resistant materials such as mortar, copper plates, and tiles, is a 2-3 story uniquely designed wooden store buildings. The“cut-out gold let-ters”are often placed directly on the façade of these buildings were for indicating the name of shop in Kanjicharacter (Chinesecharacter). The signboard buildings developed in Tokyo, the place of the earthquake reconstruction in the early Showa period, and immediately spread to other parts of Japan, especially the Kanto and Tohoku regions. These buildings can still be seen in Ishioka City, Kesennuma City, Hakodate City, and elsewhere. It seems to follow this trend that “cut-out gold letters” were installed on the facades of 2-4 stories undecorated shop buildings after World War Ⅱ (1945) in a great number of areas in Japan. Both types of buildings are going to be disappearing along with urban development and population decline, consequently these “cut-out gold letters” are also disappearing.
“Cut-out gold letter”is cut out from a piece of sawn wood with a fine grain such as Cercidiphyllum japonicum and Pinus parviflora, and the smoothed surface of each letter as a single piece is applied Urushi lacquer several times, and then all over the surface is pressed with gold leaves. Their outdoor durability was determined by visually observing based on the degree of peeling of the gold leaf, deterioration of the lacquer, and decay of the wood, comprehensively, at a distance of several meters. The degree of deterioration was evaluated on an 8-point scale from 0 to 7. If the degree of deterioration was less than 2 (the peeling of gold leaves is less thanhalf), the signboard was recognized as fare in appearance. The number of years to reach the degree of deterioration 3 (the peeling of gold leaves is more than half) was approximately 30 years after installation. Indeed, the signboard manufacturers recommended to the maintain it within less than around 15 years after installation.

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JASやAQでは，保存処理木材の品質基準として浸潤度基準が定められている。しかし浸潤度の測定方法については，呈色反応に使用する試薬が記載されているのみで，呈色面積の具体的な測定方法は定められていない。そこで本研究は，迅速な浸潤度測定方法の確立を目指した。その達成のために，これまで当社で行ってきた浸潤度測定作業を自動的に処理するプログラムを作成した。従来当社で用いてきた測定方法では，表面から特定の深さの位置を示す線の描画，未浸潤領域の面積測定，面積に基づく浸潤度の計算という少なくとも3つの作業が必要だったが，このプログラムを使用する事で，一番速い場合には試験材の四隅をクリックするという1工程のみで測定を完了できるようになった。本報告では，このプログラムを使用した浸潤度測定の概要について説明すると共に，プログラムを使用した場合の測定精度について確認した。その結果，従来の測定方法で得られた浸潤度との差は最大6％という結果が得られた。

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