There are three main types of plate boundary: divergent, convergent and transform. Plates move away from one another at divergent boundaries. This happens at mid-ocean ridges. Plates move towards one another at convergent boundaries; one plate is forced below another in a process called subduction.
The skin of a Concord grape is typically dark blue or purple, and often is covered with a lighter-coloured epicuticular wax bloom that can be rubbed off. It is a slip-skin variety, meaning that the skin is easily separated from the fruit. Concord grapes have large seeds and are highly aromatic.
Where a perfect balance of  primary pigment colors produces black, the perfect balance of  primary colors of light produces white - and these primaries are  red, green and blue. If you overlap beams of red, green and blue  light (like from LED flashlights, for example) you'll get white.