I have made pupil of eye by blending different layers in 2nd artboard but when i move it to my original sketch it become little transparent due to blending different layers. i cannot change blending to normal. So how can i solve this issue.
Select all the "blended objects" and group them. Select the entire group and in the transparency panel click the box "isolate blending"- this should keep the blending confined to the group so it does not affect other objects.