还有一些含有有害染色剂。
目的：研究菌斑染色剂的制备及质量控制。
Objective: To prepare plaque indicator and to establish its quality control method.
咖啡渣还是天然染色剂，可以用于头发，纸张，纺织品和木制品染色。
Use them as a natural dye for your hair, paper, fabric and wood.
咖啡渣还是天然染色剂，可以用于头发，纸张，纺织品和木制品染色。
Use them as a natural dye for your hair, paper, fabric and wood.
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