In Photoshop CS6, which tool allows you to replicate a specific part of an image onto another area by manually sampling a source point while also matching the texture, lighting, and shading of the destination?

In Photoshop CS6, which specific tool is used to manually change the color saturation of an image area by either intensifying it or dulling it down into grayscale tones?

In Photoshop CS6, which tool is specifically designed to reduce the 'silvering' or graying effect in the pupil of a subject's eye caused by a camera flash?