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色にまつわる2題   Two topics about color

International orange and some memory about dyeing:
It is not about the fruit, but painting color.
International orange is a color used in the aerospace industry to set objects apart from their surroundings, and has been used for painting Tokyo Tower and Golden Gate Bridge (visited 4 times) and so on.
Furthermore, it is a coloring pigment (inorganic compound) for metal painting, but I remember Orange Ⅱ in the similar color as an acid dye (organic compound with the showed chemical structure) as a dyeing researcher in my youth.