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Flag of San Diego, California - Color Changing Coffee Mug

Flag of San Diego, California - Color Changing Coffee Mug

100 in stock

Regular price $19.99 USD
Regular price Sale price $19.99 USD
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The Flag of San Diego, California - Color Changing Coffee Mug is a unique and stylish drinkware item that celebrates the rich history and vibrant culture of America's Finest City. This mug showcases an intricate design inspired by San Diego's official flag, with its iconic red star and wavy blue border reminiscent of the Pacific Ocean. The mug also features a special thermochromic coating that changes color based on the temperature of the drink inside.

Whether you're a local San Diegan or just have a soft spot for this coastal gem, this mug is an excellent addition to your morning coffee routine. The design not only serves as a conversation starter but also adds a touch of charm and California cool to your everyday life. Perfect for anyone who appreciates unique and cool drinkware.

Note: The thermochromic coating reacts to temperatures between 120°F (49°C) and 175°F (80°C). Please allow 3-5 business days for shipping. Dishwasher safe, but we recommend hand washing for longer product life.

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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.