Transparency
All graphic objects have a transparency or opacity property. Any graphic items, including frames, have a transparency setting that can be changed. If an object is transparent, the items behind the item show through. If it is opaque, it appears in whatever color, gradient, or pattern you choose.
The transparency of an object can be set in two ways. You can either set the transparency of an item through the Ink panel Or, you can select the transparency tool from the Format Toolbar.