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A Rare Specimen Found on Hill Above Fort Riley, Kansas, 420 Miles West of St. Louis, Mo. (U.S. Civil War) Color Changing Coffee Mug 11oz

A Rare Specimen Found on Hill Above Fort Riley, Kansas, 420 Miles West of St. Louis, Mo. (U.S. Civil War) Color Changing Coffee Mug 11oz

Regular price $17.99 USD
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Step back in time with this unique coffee mug, inspired by a fascinating discovery made near Fort Riley, Kansas during the U.S. Civil War era. The 11oz Color Changing Coffee Mug showcases an intriguing design that captures a rare specimen found in the region, adding a touch of history to your daily brew. As you sip your coffee, the mug transforms from a simple cup to a vibrant display, thanks to its color-changing property.

This captivating design is perfect for anyone who appreciates unique and cool drinkware, as well as history enthusiasts. Whether placed on your desk at work or used during a casual gathering, this mug serves as a conversation starter that transports you back to the times of Fort Riley's bustling activity, reminding us all of the mysteries that our past holds.

Perfect for anyone who appreciates unique and cool drinkware.

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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.