DMC 991 to Cosmo: Thread Conversion

Cosmo 939 is close-rated for DMC 991 Dark Aquamarine. At the deep end of the aquamarine family, the balance between blue and green in the teal is most consequential for how the color reads — a shift toward more blue produces a dark teal that feels more nautical, while a shift toward green reads as more botanical or mossy. For aquatic designs where 991 must integrate with its lighter family members, testing the Cosmo substitute against DMC 992 and 993 before committing confirms the teal-green balance reads cohesively across the progression.