Dot 3 is a CBS premium dichroic coating offered on thin glass COE 96. Dot 3 fires to natural rainbow in 1/2" Dots. This coating is offered on clear and black glass in a 4x4 inch square or a quarter sheet. There are approximately 66 square inches in a quarter sheet of glass. Please Note: All photos on black glass. This is a Rainbow 1 or 2 dichroic coating. This means the coating has one rainbow across a full 19" sheet of glass. When the sheet of glass is cut each piece is a different section of the rainbow. For this reason we have noted whether the pieces are predominatly warm or cool colors. The picture shown represents only one small piece of the rainbow. Please note availability when selecting products.