酸性赤染料または顔料を探しています
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弱アルカリ性の環境下で急速に色あせるインクを開発しており、専門家の方に助けを求めています！:)
こんにちは。量が少なければ、直接市場で購入できます。メーカーはすべて大容量のパッケージです。
コンゴレッドは酸性条件下で発色する
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