These are okay……

Note to self: these two are okay.

These mugs are part of a 6-mug set: http://365project.org/rhoing/365/2016-01-31
So here's the question.
Why are some of the 6 okay to microwave cooled coffee, but some of the others come out of the microwave with cool coffee and handles-and-rims too-hot-to-handle or too-hot-to-sip-from???

Determined to not get zapped again, I'm photographing them after determining whether or not they're okay to microwave. These two are okay. :-)

Happy Birthday to our first-born!

1 year ago (“George & Jean”): http://365project.org/rhoing/365/2016-01-22
2 years ago (“Huh. Sloppy plumber? What to do??”): http://365project.org/rhoing/365/2015-01-22
3 years ago (“Dwarf pomegranate”): http://365project.org/rhoing/365/2014-01-22
4 years ago (“Happy Birthday, Jen!”): http://365project.org/rhoing/365/2013-01-22
5 years ago (“Warranted Good”): http://365project.org/rhoing/365/2012-01-22
6 years ago (“Harbaugh’s Café”): http://365project.org/rhoing/365/2011-01-22

[ DSCN2296S12x9ARtm :: P&S ]

[GaryW]

My wife suggests that while they are sold as a "set" they are likely manufactured separately and may be made of different materials.

[Maggiemae]

There would have to be something in the construction of the mug that acts like metal. Can be quite dangerous so I would suggest you give these two the thumbs up!