About Aizome (Indigo-dyeing)

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*日本の藍色
藍は人類最古の植物染料のひとつ。瓶覗(かめのぞき) 、浅葱(あさぎ)、千草(ちぐさ)、縹(はなだ)、紺(こん)、褐色(かちいろ)、留紺(とまりこん)・・・藍の色はその濃淡によって表情を変え、色合いそれぞれに遊び心のある粋な名前を持ち、日本の民族色として受け継がれてきました。
世界中の天然藍には大まかに分けて蓼藍と木藍があり、徳島の藍は蓼藍です。蓼藍は濃く染めると赤みが増し紫色に近づき、木藍は山藍、インド藍などとも呼ばれ、濃く染めると赤みが消えくすんだ黒色に近づきます。蓼藍に含まれる色素は、96%が緑、1%が紫/黄色/ピンク、3%が藍色。天然の藍色の豊かな深みは、藍色とわずかに残った藍色以外の色味が重なり合って生まれます。洗うたびに色が冴えるというのは、藍色以外の色味が少しずつ抜けていくから。
*大量生産に用いられる合成藍は石油から作られた色。色素の化学式は天然の藍色と同等ですが、天然藍に含まれる他の色素はないため色の豊かさはありません。

*Indigo color in Japan Indigo colors are classified by their depth and named with playful mind: Kamenozoki, Asagi, Chigusa, Hanada, kon, Kachiiro, Tomarikon. All these colors has come down to us as Japanese ethnic colors, “Japan Blue”. Indigo is one of the oldest vegetable dyes. Indigo dyes are roughly divided into Dyer’s knotweed which is used in Tokushima, and Assam indigo which also called Indian indigo. Dyer’s knotweed generates reddish color as you dye darker and you will get purple color as a result. On the other hand, Assam indigo diminishes its own reddish tone and brings you dull blackish color. The colors of Dyer’s indigo consist of the following: 96% green, 1%violet/ yellow/pink, and 3% indigo. Rich depth in natural indigo color results from combination of indigo and other slightly left colors. It is said that the more you wash dyed textile, the brighter its color gets. This happens because the other slightly left colors are washed out and indigo color remains.
Synthetic indigo for mass production use is made from petroleum. A chemical formula of its pigment is the same as natural indigo, but synthetic indigo does not have rich depth in color since it lacks other pigments which natural indigo has.

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