The fifth installment of Greyscale’s Exposure series, Refractive Index, continues the label’s focus on vinyl DJ culture with these four gems pressed onto clear 180-gram wax. Featuring artists from around the world, this compilation blends dub techno foundations with playful rhythmic variations. Massimo Music opens the record with 'Poly Crystals', a dense, atmospheric cut driven by cascading chords that arc and shimmer over a powerful groove. An amazing track that shows the tracks don't need to be long to be as epic. Also, on Side-A, German producer Armin Bender lightens the mood with 'The Other Side'. This track’s crisp percussion and stuttering beats give it a restless energy. Bright and melodic, it carries a breezy, almost carefree vibe while maintaining just enough rhythmic complexity to avoid predictability. DJs seeking something both brisk and accessible will find it here. Flipping over, Australia’s Noosa Sound System brings 'Dub Move', merging house’s dancefloor functionality with classic dub aesthetics. The slamming beat and sharp percussive snap offer high energy, but the track still feels relaxed making it the perfect balance of the other tracks. Rounding things off, Divide & Elia s. close with 'East Side'. Driven by a shuffling breakbeat that leans towards jungle without fully embracing it, the track has raw, street-level appeal. Fast-moving and assertive, it’s a fresh contrast to the previous deeper tracks. Refractive Index is another perfect addition to the Exposure series, engineered and compiled with vinyl DJs squarely in mind.[info sheet from distr.]