Do you guarantee 100% color match?

We try our best and match as closely as possible within CMYK industry standards. Kindly consider that the colors we are seeing through our screen previews are RGB colors that are backed with light and so it may be hard to express the same brightness with CMYK. Color results may differ from stock to stock as some stocks absorb ink more than others due to thickness, coating, texture etc. Color results may differ on stocks that are colored, or stocks that have transparency. Color results can shift using the same design when the design is printed at different times as weather and other external factors can affect the outcome. Colors printed on the front and back of the card may have a shift even if the same value is used as they are run at separate times. Raised Ink  and Spot UV may shift the color of the printed area.