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Morphing Mugs Harry Potter - Marauder's Map - I Solemnly Swear – 16 oz Large Ceramic Heat Sensitive Clue Mug – Full image revealed when HOT liquid is added

Based on 4,048 reviews
Condition: New
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$23.98
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Returnable until Jan 31, 2026

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At a glance

Condition
New
Color
I Solemnly Swear
Model
MMUGC924
Dimensions
3.5"W x 4.25"H
Weight
1.27 lb
Special Feature
Color Changing
Style
Ceramic Mug
In the box
Handle

Features 5

  • Do you know Hogwarts as well as Moony, Wormtail, Padfoot and Prongs do? If you solemnly swear you are up to no good, then this 16 oz color changing mug is for you!
  • At room temperature, this mug appears to only have the Marauder's famous phrase and footprints. Add hot liquid to reveal their charmed map of Hogwarts! Mischief managed.
  • We didn't use the Doubling Charm on this product! Images are to show the mugs design from left to right. This listing is for one (1) ceramic mug.
  • To preserve the mystical abilities of this mug, we recommend hand wash only. Not microwave safe.

Description

This mug appears to have little secrets to hide, swearing to be up to no good. However, ready your wands (or your hot coffee) and reveal the hidden design! Add hot liquid and watch as the Marauder’s Map is revealed as though you had said the words, “I solemnly swear I am up to no good.” Authentic Morphing Mugs Heat Sensitive Clue Mug This is the real deal. This is the legit Morphing Heat-Sensitive Clue Mug by Trend Setters Ltd. This mug looks great sitting out on display for those who like to show off their collection. Pouring hot liquid enhances the design with a surprise reveal. Perfect for gifting or collecting, drinking or displaying!

Specs 21

Brand Morphing Mugs
Color I Solemnly Swear
Special Feature Color Changing
Style Ceramic Mug
Theme Marauders Map
Recommended Uses For Product Home
Specific Uses For Product Hot Drinks
Shape Round

Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews


Love it!
Color: I Solemnly Swear
Got this for my girlfriend and she’s a massive Harry Potter fan! The map disappears and comes back just like from the movies! It’s soo cool! Great gift idea, would recommend!
Reviewed in the United States on October 15, 2025 by Andrew

Works surprisingly well! Fun gift!
Color: I Solemnly Swear
Super cool and surprisingly efficient at changing color.
Reviewed in the United States on May 23, 2025 by Amazon Customer

I'm a potterhead so I love this.
Color: I Solemnly Swear
Great quality, visually beautiful, and I love the color change
Reviewed in the United States on May 20, 2025 by TerryD

Perfect gift for H.P fan !!
Color: I Solemnly Swear
My sis and I are big fans of the books and movies, so when I saw this I had to buy it as a gift! It works perfectly! The liquids inside the mug do have to be very hot for the gradient to register through the mug, but honestly, rinsing the outside with warm/hot water works too in uncovering the gradient. The mug size is not too small and holds a good amount of liquids for morning coffee and other hot drinks; the handle is comfortable to grasp too. Overall would definitely recommend, it's worth the buy if you're a fan :] ... show more
Reviewed in the United States on January 16, 2025 by cin

Nice mug
Color: I Solemnly Swear
It was a gift and they love it. Mug is great. Good quality and it really does change image.
Reviewed in the United States on July 4, 2025 by Taryn

Magical but doesn’t seem to last
Color: Gryffindor
You can really feel the magic with this cup when it changes colors. I got this as a gift for my person and he uses it every morning. I’m a bit disappointed that the heat changing affect has lost its magic and we have only had it for 7 months.
Reviewed in the United States on July 9, 2025 by Chuck MacDermott

Great for any Harry Potter fan
Color: I Solemnly Swear
As a Harry Potter geek I was so excited to see the Mauraders’s map appear. And even more excited when I finished my cup and mischief managed.
Reviewed in the United States on August 3, 2025 by Vancil Vancil

Please add to your Potter collection!
Color: I Solemnly Swear
Any potter fans, please buy this! My husband absolutely loves it. The mug works exactly as stated and is a decent size.
Reviewed in the United States on November 14, 2025 by Erica Maycock
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