Red Letter Day is a warm red shade in Dulux's Red family from the Dulux Malaysia colour library, identified by Dulux colour code 10YR 15​/​500. It sits within the broader Dulux Multi-Colour Tinting library rather than a named seasonal collection. Available for both interior and exterior application in Malaysia: tintable into Dulux Pentalite, Dulux Wash & Wear, Dulux EasyClean Plus, Dulux Ambiance All for interior walls, and Dulux Weathershield, Dulux Weathershield Powerflexx, Dulux Aquatech for exterior masonry — via the Dulux Multi-Colour Tinting System at any authorised dealer. With a warm red character, Red Letter Day reads as an inviting, grounding tone suited to feature walls and full-room schemes.