1、Evaluation was performed by charging 25 parts of the pigment preparation to 75 parts of a publication gravure ink vehicle containing Zn/Ca resinate,toluene,and lecithin, and 150 parts of 1/8th inch stainless steel balls.
25份的颜料和300份的1/8英寸的轴承不锈钢球估计可制备75份含有商品级丙烯树脂（Joncryl67；S.C,Johnson）的水性油墨。
这个翻译有问题么，这个evaluation是评估还是估计的意思啊
2、Water flexo ink were prepared by letting back the mill bases with additional vehicle to a pigment content of 9.0%
letting back究竟是什么意思啊？还有9.0%是这个颜料中含有9.0%的媒介物的意思什么？
25份的颜料和300份的1/8英寸的轴承不锈钢球估计可制备75份含有商品级丙烯树脂（Joncryl67；S.C,Johnson）的水性油墨。
这个翻译有问题么，这个evaluation是评估还是估计的意思啊
2、Water flexo ink were prepared by letting back the mill bases with additional vehicle to a pigment content of 9.0%
letting back究竟是什么意思啊？还有9.0%是这个颜料中含有9.0%的媒介物的意思什么？
