FRIXION

Last week's answer is ①. Did you understand Keshigumta's problem?
Please watch the movie.(Sorry! This is Japanese movie!!)

This is the commercial message for "FRIXION". In this movie , they schedule for business. First ,the man who has FRIXION ball pen says "Next meeting will be next Tuesday". Bad one after another people who is superior to the man (manager , director , president……) insists that he or she want to change the schedule for the meeting and the man needs to rewrite schedule each time they insist .Finally, the chairman appears and tells them that  the company merges with another company and the president is needed to change .
In short , this movie want to tell you that business must accompany with changing . So , business person need "FRIXION".
This week , I introduce what FRIXION is .

①What is FRIXION ?
FRIXION is ball-point pen. But we can erase words which are written by FRIXION. When we want to erase some words which are written by FRIXION , we use special rubber which is stuck to FRIXION to rub with some words. FRIXION doesn't produce any sediments when we erase by special rubber . So FRIXION is "very very special ball-point pen"
②The mechanism of FRIXION .
The ink of FRIXION has three kinds of micro capsules . They play a role as coloring matter. And the combination of capsules are changed by the heat of friction . In short , the heat of friction witch you make by using FRIXION's special rubber makes the color of words transparent . Do you understand ?
③The history of Frixion.
Surprisingly , Frixion has long history .
First , 1975 , "METAMO INK" whitch can changes its color by changing temperature is made by PILOT (PILOT is the Japanese stationary company and exploited FRIXION) . After that PILOT exploited many kinds of goods of "METAMO INK" . For example , "Magic cup" which changes its pattern by pouring hot water into cup is painted by "METAMO INK".
Second , 2005 , PILOT succeeded in exploiting "FRIXION INK" which can expand the extend of change of temperture into -20℃～65℃ . "FRIXION INK" was applied to FRIXION series .

Do you understand FRIXION ?
FRIXION is very convenient for you to rewrite your schedule when your schedule changes. Bad I want you to be careful only one point . The point is that you should not leave FRIXION on hot carpet or in front of heater . "FRIXION INK " is changed clear color by heat . So , if you expose it to hot environment ,
after that you can't write by FRIXION . Please be careful for treating of FRIXION .

Question
"FRIXION INK" has three kinds of micro capsules . Which is not capsules in FRIXION ?

①The coloring agent
②The element of hotspring
③The assistant of coloring agent
④preparation of changing temperture

Thank you for reading !