Home / Color Changing Coffee Mugs / Greeting card from Pen Mar Park (Greeting Postcards) Color Changing Mug 11oz
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Greeting card from Pen Mar Park (Greeting Postcards) Color Changing Mug 11oz

Greeting card from Pen Mar Park (Greeting Postcards) Color Changing Mug 11oz

100 in stock

$17.99 USD
$17.99 USD
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Greeting card from Pen Mar Park - Color Morphing Mug Design

A 1940s postcard-style greeting from Pen Mar Park, built around a steam locomotive crossing a railroad bridge above a wooded park landscape.

Visual Elements & Composition

Red dominates this design, covering close to half its surface, with black taking most of the remainder and small touches of yellow and white. The lettering is set in bold block capitals, reading "Greetings from PEN MAR PARK," and the publisher credit, Curt Teich & Co., Inc., appears in the visible text. Within a rectangular frame, the locomotive and its bridge run through the middle, flanked by trees and small figures of people, so the eye moves from the words to the train and back again.

Meaning & Symbolism

The locomotive is the heart of the story. Rail travel carried visitors out to Pen Mar Park, and the train here stands for arrival, leisure and the journey to a place people returned to year after year. The park landscape and the people show the destination as somewhere to gather. Printed as a vintage postcard lithograph, the piece carries the nostalgic mood of its era, the way a card from a summer outing was once kept and passed along.

Reading the Design on a Mug

A mug is held and turned in the hand, so the postcard unfolds one side at a time, the greeting on one turn and the train on the next. The design stays faint while the cup is cold and comes up when a hot drink is poured in, so the scene appears gradually, much as a message is opened and read. Pour in the morning coffee and the card surfaces, a small reveal that suits a postcard meant to be kept.

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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.