And the changing of the color when used hot water is strange to me. What really causes the change, please tell us more.
The magic behind the color-change is explained here, for example. There are two main elements that affect the change: heat-sensitive paint and the thermochromic ability of the material the mug is made of. When the temperature in the mug changes, thermochromism causes the change in color. Read the whole blog post if you want more detailed information. There are many other sources available online just like the one I linked to. 
Topic: Securing Seed Phrase Using Magic Mug Under $15 (Read 418 times)
With the right paint, you can make the mug by yourself! That's much more secure (until someone sees it) and could make a unique giveaway if you want to donate some Bitcoin to a friend.
How can someone save an important keys on a unsecured object? There are two things you must consider:
1. The mug is too open. You can not hide the seed on the mug and also you can not print the seed inside the mug.
2. The mug is breakable which disqualified the mug to be used at all cost. And the changing of the color when used hot water is strange to me. What really causes the change, please tell us more. And also everyone will have access to your secret keys. I must tell you using this your mug approach is much more dangerous or it is at owner risk. Although I discovered that you only made a suggestion not an object that one must use but a suggestion from you that in one who is interested can used to to secure their. I really appreciate your effort for taking time and explain the mug. But I advise you not to use it instead use another metal other users has mentioned.
1. The mug is too open. You can not hide the seed on the mug and also you can not print the seed inside the mug.
2. The mug is breakable which disqualified the mug to be used at all cost. And the changing of the color when used hot water is strange to me. What really causes the change, please tell us more. And also everyone will have access to your secret keys. I must tell you using this your mug approach is much more dangerous or it is at owner risk. Although I discovered that you only made a suggestion not an object that one must use but a suggestion from you that in one who is interested can used to to secure their. I really appreciate your effort for taking time and explain the mug. But I advise you not to use it instead use another metal other users has mentioned.
Perhaps not writing a seed phrase is better than that, lol. 
Further cons:
Yeah... You don't want that to happen: 
(Taken from Breaking Bad S01E03)
Further cons:
- Strangers know your seed phrase. (!!!)
- Can't be easily hidden.
(Taken from Breaking Bad S01E03)
I know it's not 100% secure. It can be broken. So, Don't use it only to secure your Seed. It's interesting, Fun, and can be necessary sometimes.
[...]
Warning: Order at least two Mugs from different shops to print your Seed phrase, and never order online. If you can Order more than two Mugs, It will be better. Use it as a secondary seed phrase backup.
I'm sorry; I commend the effort, but it's a terrible idea. The security issue is not that 'it can be broken'; it's that you're literally giving someone a clear view (maybe even written form) of your seed phrase! No matter how many more backups you have of this seed; you've now literally handed a stranger a copy of your Bitcoin seed words. Dividing it on more mugs just makes it more complicated to restore, seeing as even on this one you made, you haven't numbered the words.[...]
Warning: Order at least two Mugs from different shops to print your Seed phrase, and never order online. If you can Order more than two Mugs, It will be better. Use it as a secondary seed phrase backup.
So as Loyce suggested, printing an address QR code or a Lightning BOLT12 QR code would be a 'fun, sometimes useful' gimmick, but please not for seed words.
I cannot think of a single advantage this has over just writing down your seed phrase on paper. You should do that instead.
I tend to agree and it shouldn't be your daily use and a mug is a thing that might you're looking for daily in the morning. It's frangible and isn't right to keep your seed phrase, it might just be for fun but I think if you've valuable stuff, you shouldn't use it daily, or might be decorative stuff in a safe place that you can assure isn't get easily damage.I'd rather prefer to put your seed phrase in a book and separately right on a page that you've like, for example, your birth date.
But even that doesn't get rid of the problem that someone somewhere has to be trusted with printing the words on the cups.
While we're on the subject of insecure seed storage systems anyway, you can prevent someone from knowing it by using a chalkboard mug.Don't wash it though!
This looks fun for a qr code showing an address.
Yeah, and when someone wants to pay, then you take out a mug with a qr-code (with your bitcoin address) and hold it out for payment. The advantage of this Magic Mug Under $15 in this case will only be that you can immediately mark the deal by drinking champagne (or whatever) from this mug.
I don't like it for seed backups, sorry. The only slightly safer alternative to traditional porcelain cups is plastic or those unbreakable/break resistant mugs that are out there. But they can't change color like in your examples. Maybe something unbreakable that only glows under UV lights.
But even that doesn't get rid of the problem that someone somewhere has to be trusted with printing the words on the cups.
But even that doesn't get rid of the problem that someone somewhere has to be trusted with printing the words on the cups.
I'm sorry, but saying "It's just for fun" doesn't give you carte blanche to give out horrendously dangerous advice which will almost certainly result in the loss of your coins if anyone was to ever follow it.
It doesn't matter if you buy from four different shops, or whatever additional "precautions" you think you are taking. At the end of the day, you are still handing out your seed phrase to complete strangers and transmitting it unencrypted over unsecured channels of communication, all to end up with an incredibly fragile back up which could be irreversibly broken or damaged with a single slip of your hand.
I cannot think of a single advantage this has over just writing down your seed phrase on paper. You should do that instead.
It doesn't matter if you buy from four different shops, or whatever additional "precautions" you think you are taking. At the end of the day, you are still handing out your seed phrase to complete strangers and transmitting it unencrypted over unsecured channels of communication, all to end up with an incredibly fragile back up which could be irreversibly broken or damaged with a single slip of your hand.
I cannot think of a single advantage this has over just writing down your seed phrase on paper. You should do that instead.
In that case, it'd be more practical to replace the words with number[1]. For example, number 777 represent word "genre" while number 8 represent word "abstract".
It is worth mentioning that one should take extra care when using numbers instead of words since it works differently if you are using GitHub that is showing line numbers starting from 1 and a computer program that uses indexes that start from 0. In other words in an array, genre is 776.At that point, if you have to deal with off-by-1 errors to decode your seed phrase, you might as well just abandon the process. Most of the world's security vulns and bad bugs have come from good, bad, great programmers falling for the off-by-1 error trap.
In that case, it'd be more practical to replace the words with number[1]. For example, number 777 represent word "genre" while number 8 represent word "abstract".
It is worth mentioning that one should take extra care when using numbers instead of words since it works differently if you are using GitHub that is showing line numbers starting from 1 and a computer program that uses indexes that start from 0. In other words in an array, genre is 776. 
Imagine dropping your mug and having to glue your seed back together.
That will be more fun
It's not fun it would be a pain in the neck if the mug is crushed and nearly pulverized.
Is there a magic mug that only shows hidden text when pouring cold water? We usually use mugs for drinking coffee with hot water so if someone didn't know that magic mug and used it to drink coffee then he can able to see the text.
So it is safe if it is a magic mug that can only show hidden text with cold water.
Imagine dropping your mug and having to glue your seed back together.
That will be more fun
If you make them from four different shops, I don't think anyone can guess you are doing something stupid to secure your Seed .
I don't think we have local mug printing shops, and even if they offer it, they'd probably get it from a centralized printing facility. So that's not good..Imagine dropping your mug and having to glue your seed back together.
I think the intention for this is to have a backup "hidden in plain sight"; just left on a cupboard. It's pretty much your backup on a thing that not even a thief would think of taking.
Write them on the wall ;-) Something like:
For sure thief will not take it.
It's interesting, Fun, and can be necessary sometimes.
I can see how it's interesting/fun, but i wonder what kind of scenario where this method is necessary. All i could think is main character on movies hiding their secret.
--snip--
I think the intention for this is to have a backup "hidden in plain sight"; just left on a cupboard. It's pretty much your backup on a thing that not even a thief would think of taking. Not necessarily something you would bring yourself everywhere lol as it's not a wallet in the first place.But yea, I think this is nice if you could make one yourself; definitely not something I'd risk asking a manufacturer to make lol.
In that case, it'd be more practical to replace the words with number[1]. For example, number 777 represent word "genre" while number 8 represent word "abstract". When people discover it, it's more likely people would think you're into in "lucky" number[2-3].
[1] https://github.com/bitcoin/bips/blob/master/bip-0039/english.txt
[2] https://11points.com/11-popular-lucky-numbers-world/
[3] https://www.numerologyreader.com/what-does-the-number-777-mean-in-numerology/
I think it is a cool idea even if it has the same problem as all seeds that you can't print yourself. Still you could secure the seed with a password also for added security.
Why would anyone want to use this insecure means of storing their seedphrase, when they can get a hardware wallet for a slightly higher amount (if you're considering you would need to get two)?
Hardware wallet only generates seed in a secure environment and gives us better control over transactions, but backup is something else entirely and is a key part of securing our digital assets. Any innovative way to make backups is always welcome, although we can always talk about how reliable and safe it is in some way.
I personally would not use mugs for my seed for the reasons already mentioned, but I believe that some information can be obscured by using invisible ink which is then only visible if UV light is used, or depending on the ink if a heat source is used or certain chemical.
So Simple. I asked to print two Mugs. You may print more than four mugs. If you make them from four different shops, I don't think anyone can guess you are doing something stupid to secure your Seed . If a single mug contains 3-6 random words, It's not enough to guess it's your seed phrase.
Imagine if you forget the order of those mugs, now you have to find a programmer to write a script to brute force it . If a single mug contains 3-6 random words, It's not enough to guess it's your seed phrase. 
With 3 words a mug (12 in total) that would be simple since it's just 4 mugs and 24 permutations (40k for 24 words) but still a pain in the bum.haha
And you always may do it manually, moving mugs on the table. It would be some kind of "Hanoi tower" task
I have heard some microprocessors designers hide texts/images in their projects, I wonder if any of them hide any content related to Bitcoin.
https://www.pcmag.com/news/cool-images-hidden-on-silicon-chips
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