Photochromic Pigment – Purple, 3g [8959]

The Photochromic Pigment (Purple) is an engaging, light‑sensitive material that reacts instantly when exposed to sunlight or ultraviolet (UV) light. Under normal indoor conditions the pigment appears pale off‑white, but exposure to UV light causes it to transform into a bright, vivid purple. Once the UV source is removed, the pigment gradually fades back to its original pale colour, making the change fully reversible.

Supplied in a practical plastic syringe containing 3g of pigment, this format allows accurate dispensing and minimal waste during classroom use. When combined with a suitable binder such as an acrylic base, the pigment can be permanently applied to a wide range of surfaces including paper, card, plastic, wood, and other experimental or creative materials.

The intensity of the colour change depends on the concentration of pigment in the mixture. More diluted mixtures produce subtler colour effects, while higher concentrations give a stronger visual response. Mixing ratios are best explored experimentally, but a 50:50 pigment‑to‑binder ratio provides an excellent starting point for most investigations.

Key Features

• Photochromic purple pigment activated by UV light
• Changes from pale off‑white to vivid purple
• Reverts back when UV light is removed
• Supplied in a 3g plastic syringe for precise handling
• Can be mixed with acrylic or other suitable binders
• Colour intensity adjustable by varying mixing ratios
• Suitable for use on a wide range of surfaces

Ideal for School Science Lessons

Perfect for KS3, GCSE, and A‑Level science lessons, this photochromic pigment provides a clear and memorable way to explore the interaction between light and materials. It is especially useful for:

• Demonstrating the effects of UV radiation and light energy
• Investigating reversible physical changes
• Exploring smart and responsive materials
• Supporting cross‑curricular science and art projects
• Encouraging enquiry‑based learning through mixing, testing, and observation

Visually impressive and simple to use, the Photochromic Pigment (Purple) helps bring abstract ideas about light, energy, and material properties to life, supporting engaging, hands‑on learning in the school science laboratory.