Cosmo Embroidery Floss

520

Blues family

Looking up Cosmo 520? It's a very light blue shade (#D9E1E5 / RGB 217, 225, 229). Scroll down for Sullivans, Classic Colorworks, and Weeks Dye Works equivalents ranked by visual similarity, plus 8 close Cosmo alternatives and curated color harmonies.

Hex
#D9E1E5
RGB
217, 225, 229
HSL
200°, 19%, 87%
Lab
89.0, -1.9, -2.9
Lightness
87%
Very light
Saturation
19%
Neutral
Hue
200°
Family
Blues

Brand Equivalents for Cosmo 520

Top 5 closest matches in each brand, ranked by visual color similarity. How matching works

Cosmo 520

Sullivans

Pearl Grey Very Light 45193 82% Good
Baby Blue Ultra Light 45379 77% Approx
Antique Blue Ultra Light 45377 73% Approx
Baby Blue Very Light 45195 71% Approx
Winter White 45463 65% Approx

Crescent Colours

Cloud 010 80% Good
Snowball 186 80% Good
Baby Blanket 093 55% Fair
Magnolia Blossom 168 55% Fair
Petite Maison 127 52% Fair

Similar Cosmo Colors to 520

Closest Cosmo threads by perceptual color distance, sorted from most to least similar.

Cosmo 520
Cosmo 211 Very close ΔE 4.59 Cosmo 521A Very close ΔE 4.8 Cosmo 410A Close ΔE 5.29 Cosmo 100 Noticeable ΔE 5.75 Cosmo 730 Noticeable ΔE 5.76 Cosmo 2500 Noticeable ΔE 5.91 Cosmo 500 Noticeable ΔE 6.23 Cosmo 2211 Noticeable ΔE 8.33

Working with Cosmo 520

On white fabric
1.3:1
On dark fabric
15.9:1
Temperature
soft cool
Closest to
ivory

It reads best on black or dark fabric and can wash out on white, so reach for a dark or mid-tone ground.

Color Harmonies for Cosmo 520

Cosmo threads that pair well with 520, based on color theory harmony rules in CIELAB color space.

Complementary
Opposite on the color wheel — maximum contrast
520
101 Cosmo 101
Analogous
Adjacent hues — smooth, natural transitions
520
100 Cosmo 100 521A Cosmo 521A
Triadic
Evenly spaced at 120° — vibrant and balanced
520
111 Cosmo 111 211 Cosmo 211
Monochromatic
Same hue, different lightness — great for shading
520
156 Cosmo 156 154 Cosmo 154 2018 Cosmo 2018

Blues Family

Cosmo 520 in context with nearby shades from the blues color family.

520 520 520 410A 410A 410A 411 411 411 730 730 730 171A 171A 171A 522 522 522 412 412 412

About Cosmo 520

Meet Cosmo 520 — a muted, very light hand-dyed thread in the blues family with sky blue tones. The shade reads as soft and quiet — a go-to choice for skies and water. It also turns up in patterns built around denim textures and cool-toned backgrounds.

Frequently Asked Questions

Cosmo 520 — what color is it?

Cosmo 520 is a very light blue thread (hex #D9E1E5, RGB 217, 225, 229). It shows up most in bluebird motifs and whale designs.

What is the DMC equivalent of Cosmo 520?

The closest DMC match for Cosmo 520 is DMC 3756 (Baby Blue ultra very light) with a 81% match based on visual color similarity. Other near matches include DMC B5200 (Snow White, 65%) and DMC 27 (White Violet, 65%).

Which Cosmo threads are close to 520?

The closest Cosmo threads to 520 are 211 (ΔE 4.59), 521A (ΔE 4.8), and 410A (ΔE 5.29). These are useful substitutes when 520 is unavailable or for building gradients.

What is Cosmo 520 good for?

Cosmo 520 is commonly used in cross-stitch projects featuring bluebird motifs, whale designs, sapphire accents, porcelain patterns. Its very light tone works well for standalone motifs and as part of larger palettes. This page includes color harmonies and similar shades to pair with 520.

What fabric color works best with Cosmo 520?

It reads best on black or dark fabric and can wash out on white, so reach for a dark or mid-tone ground. For reference, 520 has a contrast ratio of about 1.3:1 on white fabric and 15.9:1 on black. As a soft cool shade, its cool cast recedes visually — useful for backgrounds, shadows, water and sky, and calm, restful palettes.

Cosmo Color Chart Cosmo ↔ DMC Conversion