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Flag of St. Louis, Missouri - Color Changing Coffee Mug

Flag of St. Louis, Missouri - Color Changing Coffee Mug

Regular price $19.99 USD
Regular price Sale price $19.99 USD
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Experience a piece of St. Louis, Missouri's rich history with every sip from this color-changing coffee mug. Inspired by the iconic Flag of St. Louis, this unique drinkware features the vibrant red and white design that symbolizes the city's spirit. The artwork on the mug captures the bold stripes and fleur-de-lis, creating a striking visual that pays homage to the city's heritage. Ideal for history enthusiasts or locals who take pride in their city, this color-changing coffee mug is perfect for anyone who appreciates unique and cool drinkware.

Each time you pour a hot beverage into the mug, the design transforms from its subtle white background to bold red stripes. This thermochromic effect adds an element of surprise and fun to your daily coffee routine, making it a conversation starter among friends or colleagues. Whether you're sipping on coffee at home or bringing it to the office, this color-changing Flag of St. Louis coffee mug is a stylish way to showcase your city pride.

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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.