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:

1.  Bernoulli's Principle

2.  Field Trip to the Ecotarium 

3.  Learning About Air Molecules

4.  Kitchen Science; Baking cupcakes

5.  Corn Maze Field Trip 

6.  Birds of Florida 

7.  Static foil drum

8.  Un-Make it Monday; Seeing Inside our DVD/VCR player

9. Wind Tunnel Experiment 

10. Biomes Marine Biology Center Field Trip  

11. Disappearing Coin Trick and the Science Behind it. 

12.  Snuff Out a Candle with Baking Soda and Vinegar

13.  Making Plastic from Milk

14.  Pencil in the Rice Friction Experiment

15 & 16.  Two Experiments using SNOW

17.  Making an Iceberg 

18.  Making an Egg Float

19.  Looking at Microscopic Organisms 

20.  Eco Plant pals

21&22.  Two Experiments with Cotton Candy

23. Springfield Science Museum Trip

24.  Teaching Children the Signs of Spring

25.  Color Changing Slime

26.  Growing Tickle Me Plants

27.  Learning About Soil Sampling

28.  Making Super Bouncy Balls 

29. Exploring the New England Shoreline

30.  Color Changing Flower Experiment 

31.  Roger Williams Zoo Trip

32.  Edible Silly Putty 

33.  Raising Tadpoles

34. More Microscope Fun

35. Making Homemade Ice Cream

36.  Observing Plants Breathe 

37.  Trip to Save the Bay Exploration Center and Aquarium

38. Making Fresh Peach Preserves 

39.  Making Solar S'mores

40.  Growing a Crystal Garden

41 & 42.  Jolly Rancher Candy Apples and Lollipops

43.  Volcanic Lemons 

44.  Oozing Pumpkins 

45.  Growing a Germ Farm

46.  Looking at the Germ Farm Under a Microscope

47 & 48.  Building Model Molecules Two Ways 

49.  Kitchen Chemistry Experiments 

50.  Fall Leaf Chromatography 

51.  Color Changing Experiments with Iodine

52.  Learning About Birds in Winter

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
68. 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?