New brothread UV Colour Changing Embroidery Thread Kit — 8 Spools 30WT Polyester, Machine-Ready

New brothread 8 Spools UV Colour Changing Embroidery Thread Kit is a set of 100% polyester 30WT machine threads that visibly shift colour when exposed to sunlight or UV light, then revert indoors.

This kit contains eight spools of UV-reactive embroidery thread designed for machine and hand work. Each spool produces a distinct colour transformation under UV light, making it easy to add dynamic accents to apparel, caps, home textiles, bags and pet items. The threads are 30WT (150D/2), durable for machine embroidery and quilting, and formulated from first-class polyester to remain soft next to skin.

How does the colour change work and how long does it last?

The thread contains UV-reactive dyes that shift hues when exposed to sunlight or UV lamps. While under UV, the changed colour is stable; once the UV source is removed, the thread reverts to its original shade within minutes. The effect is reversible and repeatable, suitable for both subtle accents and bold outdoor details.

• Colour shift activates under sunlight or any UV light source.
• Changed colour remains while UV exposure continues.
• Reverts to original colour after a few minutes indoors without UV.
• Repeatable through multiple UV cycles without special treatment.

Will these threads work in my embroidery machine and how should I thread them?

Yes — the 30WT (150D/2) weight is compatible with most home and commercial embroidery machines. To reduce breakage and friction, use large-eye needles such as SCHMETZ Topstitch 90/14 or Organ HAX1 SP 90/14, and keep machine tension moderate. For best results, test a sample stitch before finishing a project.

• Recommended needle: size 90/14 large-eye needles.
• Use moderate machine tension and a stabiliser appropriate for your fabric.
• Run a pre-test swatch to set stitch density and speed.
• Apply non-staining silicone spray or sew-er’s aid sparingly if needed.

How do I care for finished items made with UV colour changing thread?

This polyester thread is washable, but follow temperature limits to protect the dye. Avoid bleaching and steam ironing; dry ironing is allowed but not above 176°F (80°C). Washing in water under 104°F (40°C) will preserve the thread and its changing properties over many cycles.

• Do not bleach; avoid steam ironing and dry clean if possible.
• Max dry iron temperature: 176°F (80°C).
• Wash water should not exceed 104°F (40°C).
• Patience: colour change is UV-dependent, not permanent fading.

What projects show off these threads best?

Denser stitches and multiple outline passes make the UV shift more visible, so use these threads for emblems, logos, caps, outerwear trims, and children’s or pet gear that sees sunlight. The effect is especially striking on outdoor-facing surfaces and layered stitchwork where contrast and texture amplify the change.

• Outdoor caps, backpacks, and jacket logos for visible UV reaction.
• Children’s apparel and pet accessories for playful colour surprises.
• Quilting and appliqué with dense stitch areas to maximize impact.
• Decorative seams and topstitching where light will hit the threads.

Who is this for: Makers, small-batch apparel brands, embroidery hobbyists, quilters and crafters who want reversible, eye-catching effects without specialty inks. If you work with machine embroidery or hand-detailing and want a washable, skin-friendly polyester thread that adds interactive visual interest outdoors, this New brothread 8-spool kit gives eight distinct UV-reactive colours in a durable 30WT format.