King Cole Firefly Aran — Glow Worm (6574)

The most genuinely iridescent shade King Cole has produced. Glow Worm reads as near-black from a distance, then reveals shifting passages of rose pink, teal, midnight blue and warm amber as it catches the light — the exact oil-on-water effect you see on a beetle's back.

It's a chameleon in a finished garment. Under lamplight it looks like a dark neutral with a secret; in daylight the colours separate out. If you only stock one shade for evening and occasion knits, make it this one.

Palette: black, rose pink, teal, midnight blue, amber

Perfect for: evening wraps, wedding-guest shawls, party tops, statement cowls

Brand: King Cole

Yarn Name: Firefly Aran

Yarn Code: 6574

Colour Name: Glow Worm

Yarn Weight: Aran (worsted / 10-ply)

Ball Weight: 100g

Length: 200m / 219yds

Hook Size: 5mm–5.5mm

Blend: 65% Polyester, 35% Acrylic

Hashtag: #kingColeFirefly

Firefly Aran isn't a glitter yarn — there's no metallic thread and no scratch. The shimmer is built into the fibre itself, giving knitted and crocheted fabric a soft halo and a light-catching glow that shifts as you move. Buy your full quantity in one go where you can, and join new balls at a matching point in the colour run to keep the transitions seamless.