Magictees Tee Shirt That Are Colour Changing in the Sun, Not Heat! the Inks Are Made From Unique Patented Materials, Which Magically Change Colour in UV Ultra Violet Sunlight. Indoors They Are White, When You Are Out in the Sunlight They Magically Change to ‘full-on’ Colour in Seconds. Even Under a Cloudy Sky They Change to Beautiful Pastel Shades, When No Longer in Sunlight They Return Back to Their Original White Colour in Minutes. You Can Literally Watch Them Change Colour Before Your Eyes. Our Plastisol Magicinks Have All the Same Properties as Normal Plastisol Inks, & the Usage, Application, Washing Instructions, & Lifespan Are All the Same. the Key Difference is That It Colour Changing in Sunlight & We Have Specially Formulated It So That It has a Life in Terms of Durability, & Longevity of Colour Changing That Usually Out Lives the Life of the Garment Itself!. Minimum Quantities Apply.