Yes, please refrigerate after opening.
The color of the olive corresponds to how ripe they are when picked, in addition to the curing process they undergo. Green olives are picked before ripening, and black olives are picked while ripe, which is when the color has turned from green to black.
Peppers can vary in color, taste and texture. Although we strive hard to uniformly fill this product, environmental conditions including temperature, wet/dry weather, and the location of where the pepper crop is grown all can affect the texture and taste of the peppers.
You can find them in the condiments section of most grocery stores.