发明授权
US3972879A Process for isolating easily soluble basic oxazine dyestuffs and phenazine dyestuffs 失效
分离容易溶解的基本恶嗪染料和吩嗪染料的方法

Process for isolating easily soluble basic oxazine dyestuffs and
phenazine dyestuffs
摘要:
Basic oxazine and phenazine dyestuffs are isolated from their solutions by adding urea or thiourea.
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