Japanese Color Atlas日本色譜あいいろ · Indigo · family blue
藍色 (Ai-iro) is catalogued here as indigo. Aizome indigo dye tradition with well-documented historical usage; indigo colorant studies exist but no per-record physical-sample measurement is attached, so HEX is a screen approximation, not direct sRGB colorimetry.
Tobunken records the underlying color/material term in the Nara-period vocabulary database derived from 『大日本古文書』; this supports historical name attestation, not measured sRGB.
Conservation-science studies publish spectral/reflectance evidence for the related pigment or dye family. This supports the material context, not a per-record measurement; the displayed HEX remains a digital approximation.
Name appears in at least one CC BY-SA Wikipedia traditional Japanese color list; HEX remains a Chroma Cathay digital approximation for design use.
Traditional color names predate modern screen color spaces, so this HEX value is a design approximation rather than a material measurement.
These entries preserve historical material, pigment, dye, or alternate-graph evidence without treating it as a direct HEX source for this color.
SOURCE BASIS Tobunken's 彩色DB records 藍 (indigo plant) and 青黛 (indigo blue) in Nara-period documents.
RELATIONSHIP 藍 is the indigo plant and 青黛 its prepared blue; together they are the dye basis of 藍色.
CAVEAT Dye-material context only. The displayed HEX is a screen approximation, not a measured textile value.
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