| 摘要 |
A composition comprising, in a medium that is suitable for dyeing, at least one ninhydrin derivative chosen from compounds of formula (I) and tautomers thereof: wherein: A represents a fused or non-fused, at least 6-membered aromatic mono- or polycyclic group, possibly comprising at least one hetero atom chosen from nitrogen, oxygen, sulphur, and phosphorus atoms, a dyeing process using the composition, and a multi-component coloring agent comprising the composition.
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