50 Colones Menelaus blue morpho, colourized

Costa Rica's Banco Central introduced colorized circulating coinage largely in response to a broader regional push toward visually distinct denominations to aid the elderly and low-literacy populations in differentiating coins by feel and sight simultaneously. The Menelaus blue morpho — Morpho menelaus — is native to the tropical rainforests of Central and South America and has been a recurring symbol in Costa Rican conservation messaging for decades.

The acrylic color application on a circulating coin remains technically demanding; field wear causes delamination over time, making high-grade survivors of any colorized circulation issue disproportionately scarce within a few years of release.