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.
I'm partial to purple, but I grow lilacs of many colors and shades -- lilac, white, blue, purple, magenta, violet, and pink. There's even a yellowish lilacâS. vulgaris 'Primrose'. It's not the color of dandelions, but rather a luscious creamy yellow.