#638c97

Coats Sylko B6399 Medium Blue / Grey

HEX #638c97 · RGB 99, 140, 151 · CIELAB L 56 a -11 b -10

Coats Sylko B6399 Medium Blue / Grey is a medium, muted cyan blue, HEX #638c97. No other brand comes very close to this one, so compare the alternatives below against a real thread card before you commit.

Open in converter Shop this thread ↗ Full Coats Sylko chart

Equivalent colors in other brands

Brand	Number	Name	HEX	Match	Alternatives
Brother Embroidery full chart	019	Sky Blue	#2584bb	Poor match ΔE 13.3	817 534
Fil-Tec Glide full chart	65483	Tidewater	#609191	Approximate ΔE 6.1	27500 30646
Floriani Polyester full chart	484	Country Gray	#748c8d	Approximate ΔE 5.4	312 342
Gunold POLY 40 full chart	61046	Teal	#6d8f8f	Approximate ΔE 5.1	61443 61513
Hemingworth PolySelect full chart	1193	Light Slate Blue	#5e9cae	Approximate ΔE 6.0	1075 1240
Isacord 40 full chart	4032	Teal	#6699af	Approximate ΔE 5.9	4643 3830
Janome Polyester full chart	221	Gray	#889b9b	Approximate ΔE 9.1	216 230
Madeira Classic Rayon 40 full chart	1360	Country Blue	#7691a1	Approximate ΔE 6.0	1163 1289
Madeira Polyneon 40 full chart	1960	Country Blue	#738c9e	Approximate ΔE 6.8	1671 1828
Marathon Polyester full chart	2267	Smoke Blue	#66828c	Close ΔE 4.5	2112 2266
Marathon Rayon full chart	1250	Wonder Blue	#5e98ac	Approximate ΔE 5.2	1287 1288
Mettler Poly Sheen full chart	4332	Rough Sea	#739fae	Approximate ΔE 6.6	4421 0108
Robison-Anton Super Brite Rayon full chart	2577	Wonder Blue	#5e99aa	Approximate ΔE 5.0	2308 2443
Robison-Anton Super Strength Polyester full chart	9105	Mountainview	#008490	Poor match ΔE 10.2	5609 5607
Sulky PolyLite / Poly Deco full chart	3884	Country Blue	#6e8c97	Close ΔE 3.0	61046 1205
Sulky Rayon 40 full chart	1205	Med. Jade	#6e90a5	Approximate ΔE 6.0	1550 1295

Match quality is the CIEDE2000 color difference (ΔE00) worked out from screen RGB values. Check a real thread card before you order.

Similar colors within Coats Sylko

B6628 Dark Aqua Green B6362 Medium Turqoise Blue B6350 Dark Turquoise Blue B6999 Medium Turquoise Blue

Frequently asked questions

What is the Brother Embroidery equivalent of Coats Sylko B6399?

The table on this page gives the closest match and two alternatives for every brand.

What are the HEX and RGB values of Coats Sylko B6399 Medium Blue / Grey?

On screen it is #638c97, RGB 99, 140, 151. That is the manufacturer's published screen value; the stitched thread will look a little different depending on sheen and light.