Unverified88% confidenceFactTime unknown
蓝黑墨水含鞣酸铁成分,书写后遇空气氧化由蓝转黑,具备防涂改和长期保存特性(可存数十年不褪色),适合签名/档案;纯蓝墨水易水洗、易褪色,仅适合练字
1
Sources
88%
Confidence
Long-term
Relevance
-
First Seen
Sources
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