这些果皮的色素不允许掺混进葡萄汁中。
The colouring pigments from the skins are not allowed to bleed into the grape juice.
本试验以法国膨润土为对照，研究了国产ZGB-3型膨润土对葡萄汁的澄清效果以及对葡萄酒中的铜、蛋白质和色素的稳定作用。
The effects of the Chinese bentonite for the must clarification and for the stabilization of copper ion, protein and color of wine were studied, in comparison with those of the French bentonite.
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