DMC 548 to Cosmo: Thread Conversion

Cosmo 178 is a close match for DMC 548. At the vanishing point of color, where 548 barely registers as blue at all, the main question for any substitute is whether it is cooler or warmer than white — and Cosmo 178 should be evaluated precisely on that axis. Compare on a swatch of your project fabric alongside your lightest skin-tone or neutral thread: if the Cosmo reads as perceptibly cooler than those threads, it is performing 548's essential function. If the warmth or coolness difference is negligible, the substitution is effective regardless of technical precision.