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Flag of Longmont (Colorado) - Color Changing Coffee Mug

Flag of Longmont (Colorado) - Color Changing Coffee Mug

Regular price $19.99 USD
Regular price Sale price $19.99 USD
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The Flag of Longmont (Colorado) - Color Changing Coffee Mug is a unique drinkware piece that combines local symbolism with the intriguing phenomenon of thermochromic technology. This mug showcases the official flag design of Longmont, Colorado, which features a green field with three horizontal stripes representing agriculture, industry, and recreation, alongside the city's seal. The seal contains a shield divided into four quadrants, each symbolizing different aspects of Longmont's history: a windmill, a steam engine, a wheat stalk, and an evergreen tree. As the temperature changes with your beverage, this mug transforms the design elements from their original colors to a striking contrast that brings out the vibrancy of the flag. This color-changing feature adds an interactive element, making each sip a delightful experience. Perfect for anyone who appreciates unique and cool drinkware, as well as Longmont residents or enthusiasts seeking a meaningful keepsake.

This coffee mug serves not only as a practical drinking vessel but also as a conversation starter and collector's item. Its design ties together the rich history of Longmont with modern technology to create an eye-catching piece that will be cherished in any kitchen or office space. Whether you're a Longmont local, a Colorado native, or simply someone who admires unique drinkware, this mug is sure to become a valued addition to your collection.

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Color-changing ceramic mugs with a glossy finish, black exterior, and white interior. Available in one size: 11 oz (≈330 ml). Heat-reactive coating reveals your custom design when filled with hot liquid. BPA- and lead-free, with a comfortable C-handle.

This mug brings a playful twist to the daily coffee or tea ritual. At room temperature, it looks like a simple black mug with a glossy finish. But add a hot beverage, and your chosen design fades into view, showing vivid colors against the white interior.

The ceramic body is durable enough for repeated use, while the C-shaped handle balances comfort and grip. Printing uses sublimation techniques that fuse color into the heat-reactive surface for crisp results when the design appears.

  • Material: ceramic with glossy black exterior and white interior.
  • Size: one standard size, 11 oz (≈330 ml).
  • Finish: glossy glaze with heat-sensitive surface.
  • Printing: sublimation process produces crisp, vibrant colors.
  • Safety: BPA-free and lead-free, suitable for everyday drinks.
  • Effect: design is faintly visible when cold, fully revealed when hot.

Perfect as a novelty gift or a fun personal mug, the heat-reactive design makes coffee breaks more engaging. It works well for morning coffee, afternoon tea, or hot chocolate.

  1. Daily routine: fill with any hot beverage to reveal your chosen artwork.
  2. Gifting: the “magic” reveal makes it a memorable present for birthdays, holidays, or office exchanges.
  3. Office use: sparks conversation while still being practical for everyday drinks.

Note: for best results, avoid designs that rely heavily on deep black backgrounds, as they may blend with the mug’s surface when cold.

Unlike standard mugs, color-changing mugs require gentler care to preserve the heat-reactive coating. Hand-wash only — avoid the dishwasher and abrasive scrubbers, which can damage the finish and reduce the effect.

The mug is safe for short microwave use when heating liquids, but repeated high-heat cycles may shorten the lifespan of the coating. Always allow the mug to cool before washing.

Available in one classic size: 11 oz (approximately 330 ml). It’s large enough for most standard coffee makers and fits comfortably in most cabinets.

Size guide

All measurements are product dimensions in inches.

11 oz
Height (in) 3.78
Diameter (in) 3.23
Diameter w/ handle (in) 4.76

Note: measurements are approximate; slight variations may occur due to manufacturing tolerances.