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Flag of Otsu Shiga Japan - Color Changing Mug 11oz

Flag of Otsu Shiga Japan - Color Changing Mug 11oz

100 in stock

Regular price $17.99 USD
Regular price Sale price $17.99 USD
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Flag of Otsu Shiga (Japan) - Color Morphing Mug Design

This design reproduces the official municipal flag of Otsu, the capital of Shiga Prefecture in Japan, as a clean, flat emblem.

Visual Elements & Composition

White dominates the field, covering roughly 85 percent of the design, with a deep cobalt blue (#0a2cc8) taking the remaining 15 percent. The emblem is built from three shapes: a five-pointed star, a ring, and a band of waves. Nothing is decorative for its own sake. Each element sits in its place with the restraint of a formal symbol, and the flat vector rendering keeps every edge crisp.

Meaning & Symbolism

A municipal flag is a civic signature. Otsu adopted this emblem for public use, and it stands for the local government and the identity of the city within the Kansai region. The star, ring and waves work as a compact visual vocabulary that the city recognises as its own. Reading the flag is a way of reading the place: its administrative standing, its position on the shores of Lake Biwa, and the pride its residents take in a symbol designed to be used in public life.

Designed for the Curve of a Mug

A mug is turned in the hand, so the emblem has to hold its shape as the eye moves around the cup. The star and ring sit clearly against the white field, and the waves run in a line that carries the eye across the surface. Because the colour-changing glaze reveals the artwork only once a hot drink is poured in, the flag appears as a small reward for the first sip, a quiet emblem that arrives with the coffee.

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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.