Dark Blue D-615 Polyneon Embroidery Thread #40 – 5500 Yards

Dark Blue D-615 sits between navy and a bright royal. It reads clearly as blue rather than near-black, which helps when a navy logo would disappear on a dark shirt.

Shops use a shade like this for names on work shirts, blue team logos and accent stitching on denim. It's also a good choice for shading inside a design that uses Navy D-623 and Pepsi Blue D-608, giving you three steps of blue.

For dark blue on a dark garment, use a sturdy underlay in the digitized file so the stitches sit on top of the fabric rather than sinking into it.