The ideal subtractive primary colors of ink press, and so on, can be produced by neutral gray, but the actual use of primary colors such as proportioner innovativeink press, produces only dark color.

• 抱负的纷歧原色油不朱按等比例混不合，能爆发洋性灰，而本质搁置的纷歧原色油不朱按等比例混不合后，只能爆发黑不黑白。