665
Blues family
Cosmo 665 has hex #353A7D and RGB 53, 58, 125. This medium-dark, moderately saturated blue thread sits alongside its closest DMC, Anchor, and Madeira matches below, with 8 similar Cosmo shades and a panel of color harmonies for palette planning.
Brand Equivalents for Cosmo 665
Top 5 closest matches in each brand, ranked by visual color similarity. How matching works
DMC
Anchor
Madeira
J&P Coates
Sullivans
Classic Colorworks
Weeks Dye Works
Gentle Art Sampler
Valdani
Crescent Colours
Similar Cosmo Colors to 665
Closest Cosmo threads by perceptual color distance, sorted from most to least similar.
Working with Cosmo 665
It has moderate contrast on both light and dark fabric — usable on either, but test a few stitches on your chosen ground first.
Because Cosmo 216 is so near (ΔE 1.62), the pair makes a natural two-step gradient — handy for shading skin, petals, or skies without a hard seam.
Color Harmonies for Cosmo 665
Cosmo threads that pair well with 665, based on color theory harmony rules in CIELAB color space.
Blues Family
Cosmo 665 in context with nearby shades from the blues color family.
About Cosmo 665
A moderately saturated, medium-dark member of the blues family, Cosmo 665 is a hand-dyed floss with true blue tones. Its tone is deep and intense, making it a popular choice for denim textures and cool-toned backgrounds. It pairs nicely in designs that call for nautical themes or winter scenes.
Frequently Asked Questions
What does Cosmo 665 look like?
Cosmo 665 is a medium-dark shade in the blues family with hex #353A7D and RGB 53, 58, 125. Stitchers reach for it in projects featuring sapphire accents and porcelain patterns.
Which DMC thread matches Cosmo 665?
The closest DMC match for Cosmo 665 is DMC 792 (Cornflower Blue dark) with a 93% match based on visual color similarity. Other near matches include DMC 797 (Royal Blue, 88%) and DMC 796 (Royal Blue dark, 76%).
What Cosmo colors are similar to 665?
The closest Cosmo threads to 665 are 216 (ΔE 1.62), 2664 (ΔE 3.15), and 4792 (ΔE 3.19). These are useful substitutes when 665 is unavailable or for building gradients.
When should I use Cosmo 665?
Reach for Cosmo 665 when your project calls for sapphire accents, porcelain patterns, hydrangea blooms, skies. Its medium-dark character carries both small accents and wider palette work; the harmony picks on this page show natural companions to 665.
What fabric color works best with Cosmo 665?
It has moderate contrast on both light and dark fabric — usable on either, but test a few stitches on your chosen ground first. For reference, 665 has a contrast ratio of about 10.2:1 on white fabric and 2.1:1 on black. As a cool shade, its cool cast recedes visually — useful for backgrounds, shadows, water and sky, and calm, restful palettes.