DMC 991 to Sullivans: Thread Conversion
The closest Sullivans equivalent to DMC 991 (Dark Aquamarine) is Sullivans 45311.
Close MatchHex #477B6E · greens family
Only the DMC swatch is rendered as stored color data here. Compare the physical target skein before you assume a visual match.
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Conversion Notes
Sullivans 45311 is close for DMC 991. For general ocean and teal-green designs where the deep shadow value in the aquamarine family is the primary need, Sullivans provides an adequate substitute in the correct color territory. At this darker value position, the reduced eye sensitivity to hue differences in deep shadows means the close rating carries less practical risk than it would at a medium or light aquamarine position — making Sullivans 45311 more confidently usable here than close-rated alternatives would be for 992 or 993. The key quality to verify in any substitute at this dark shadow position is that it reads as genuinely deeper than the 992 equivalent — a substitute sitting at the same value as the medium fill would collapse the shadow step and eliminate the progression's depth impression. For designs using 991 as a standalone deep teal accent without multi-value gradient context, Sullivans 45311 reads as the correct rich dark aquamarine in most finished applications. Purchasing all required skeins in one dye lot is important for consistent shadow fills across large ocean and reef areas.
Reference quality
How We Validate This Match
This Sullivans page is meant to help you shortlist a replacement quickly, then verify the physical skein before you mix brands in the same stitched area.
- Methodology
- This comparison uses the site's source-of-truth record for DMC 991, the stored Sullivans equivalent, and the saved close rating before rendering the page copy.
- Verification status
- Close cross-brand match. Treat it as a shortlist, not proof that the physical threads will be visually identical under every fabric and light condition.
- Source basis
- Published cross-brand floss chart mapping. Use it as a shortlist, then confirm with physical thread because sheen and dye lots still matter.
- Last reviewed
- 2026-04-20
- Best use
- Close and approximate matches work best for replacements, backups, or whole-project brand swaps after you stitch a small sample on the target fabric.
Decision guide
When to trust DMC 991 to Sullivans 45311
This page is strongest as a decision aid, not as a guarantee that two branded skeins will vanish into each other without testing.
Best for
- + Replacing missing floss when DMC 991 is unavailable and Sullivans 45311 is good enough after a stitched sample check.
- + Shortlisting a Sullivans substitute before you buy skeins, especially if your project can tolerate small differences in sheen or dye lot.
- + Comparing this Sullivans candidate against the other conversions and nearby DMC shades linked from the page before you commit to a full swap.
Watch for
- ! Close matches are not safe to assume interchangeable in focal areas without a physical test on your fabric.
- ! Brand sheen, strand thickness, and project lighting can make DMC 991 and Sullivans 45311 look further apart than the stored match rating suggests.
- ! If the design depends on smooth gradients or skin-tone transitions, compare this swap against the neighboring DMC shades before you substitute a large block.
Before you commit
- Compare DMC 991 and Sullivans 45311: lay the physical skeins together in daylight before you mix brands in the same stitched area.
- Test on your project fabric: stitch a small sample so fabric color and stitch density reveal whether the match still holds at full coverage.
- Keep a fallback ready: if the swap feels off, use the linked related DMC shades or another brand conversion instead of forcing the closest stored match.
DMC 991 to Sullivans FAQ
These answers are the same statements published in this page's FAQ structured data.
What is the Sullivans equivalent of DMC 991?+
The closest Sullivans equivalent to DMC 991 (Dark Aquamarine) is Sullivans 45311. This is a close match.
Is the DMC 991 to Sullivans conversion exact?+
The conversion from DMC 991 (Dark Aquamarine) to Sullivans 45311 is rated as a close match. Thread colors vary slightly between brands, so compare physical thread in daylight before stitching a large area.
Can I mix DMC 991 and Sullivans 45311 in the same project?+
You can use DMC 991 and Sullivans 45311 together when the close match is acceptable for your project, but always test them side by side on your fabric first because sheen and dye lots can create visible differences.
Other Conversions for DMC 991
Similar DMC Colors
Shades closest to DMC 991 — handy if Sullivans 45311 isn't quite right:
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