100 Days of Sciene #86-- Disappearing and Re-Appearing Ink

I bought these Frixion markers a long time ago because I read about how they disappear in extreme heat but will reappear when you cool the paper & ink back off.  I wanted to try it and see for myself... We also use the ink pens for our everyday schoolwork and I thought it would be fun to see if we could get both of these inks to disappear and reappear.

First we wrote with the markers and pens on plain white paper.

Then we brainstormed various ways to heat up our ink.  The eraser at the end of the maker and pen bring the ink up to 65 degrees Celsius or 149 Fahrenheit.

When they first came out with the pens the temperature differences were not as great and the developers kept working on it to make sure they didn't have an ink that would just disappear when left in a hot car.

We decided to use a hair dryer set on it's hottest setting and it worked perfectly!

We set the paper in the freezer to cool off and see if the inks would come back.  They do but as you can see they aren't quite as vibrant as what we started with.

We then did the whole experiment over using the pens-- and got pretty much the same results.

Have you ever worked with thermal changing inks?  This experiment reminded us a lot of our color changing slime one (#25 on the list below).

Others in this series:
53. Iodine and Starch Experiment
54. Flouride and Calcium Experiment
55. Botanical Gardens in Winter
56.  Making Cell Models
57. Which Has More Water; Ice or Snow?
58. Exploding Snow and Water Baggies
59.  Exploring Minerals
60. Visiting the Hartford Science Museum
61-63. 3 STEM Bridge Challenges
64. Making Models of the Earth
65. Plate Techtonics with Graham Crackers
66.  Homemade Lava Lamp
67.  Science Movies We're Watching
Index Card Towers

69.  Botany at the Botanical Gardens
70. Best Board Games for Science 
71. Homemade Frozen Yogurt Pops
72.  Starburst Rock Cycle 
73. & 74. Sinking a Marshmallow
75. Jumping Conversation Hearts 
76-78. Building a Paper Airplane 3 Ways 
79. Learning About Hummingbirds 
80.  Planting an Herb Garden 
81. Mushroom Spores 
82. - 84.  Penny Saturation Experiments 
85. Sink or Float?


  1. I love markers anyway but these are soooo cool!

  2. These are really coooool ! Where were them when we were kids!!!!!

    1. I thought the same thing! I would have loved erasable markers when I was younger.

  3. Thank you for sharing at #OverTheMoon. Pinned and shared.

  4. These pens are SO cool! They are my go-to for planner writing...They erase so cleanly! This is a really neat lesson!

    1. They really do erase so nicely! We love them.


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