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在九年义务教育生物课中我们初步学了相关染色的基本实验：实验中对染色质(体)进行染色，须使用龙胆紫溶液或醋酸洋红溶液等碱性染色剂，这些染色剂是以龙胆紫或洋红溶解于醋酸溶液中制得，配制后的龙胆紫溶液pH值约小于7(呈酸性)。染色质(体)容易被碱性染料染成深色。那么为什么把龙胆紫溶液称为碱性染色剂呢?加强染色成效，须强化学酸性染料染色原理及目的。作为染色剂必须具备两个条件：一是具有颜色;二是要与被染组织间有亲和力。
