There are many different colors and opacities when dealing with decking stain. Before searching for a deck stain, you should determine the look you want. Some stains (solid colors) will completely hide the wood grain while others (transparent and semi-transparent) while allow the grain to show through, this is referred to as opacity. The higher the opacity the more pigmentation resulting in less wood grain showing.
Color is the tint or hue a deck stain has. Many different colors and tints can be added to stain. The most common are natural wood colors, redwoods, and darker browns. Color is directly related to opacity. Lower opacity of a stain allows the wood's natural color to show through more while a higher opacity will hide more of the wood's color resulting in more of the stain's color or pigment to show. While all deck stains provide water protection, the more pigment a stain has the more UV protection it provides. A clear stain would provide almost zero UV protection while a solid stain would provide the most protection from the sun.