For those who learned chemical b4, pls come in.

• silvercap

  18 Jun 07, 03:55

  I remember last time there is a kind of small plastic toy(dinosour, car..) can automatic change color when dip into hot/cold water, I was wonder what kind of chemical there 're using within the plastic?
  
  Any one can tell?
  
  
• omgukilledkenny

  18 Jun 07, 04:01

  no idea
• xalkyrie

  18 Jun 07, 04:12

  chemicals? it's obviously magic water.
• silvercap

  18 Jun 07, 04:16

  Originally posted by xalkyrie:

  chemicals? it's obviously magic water.

  no lah, not magic.
  
  Last time I went to 7-eleven bought ice-cream, there also came out with this plastic spoon, when u dip into the cold ice-cream, the spoon will change color.
  
  
• silvercap

  20 Jun 07, 18:25

  bump
• Darkness_hacker99

  20 Jun 07, 18:27

  Originally posted by silvercap:

  no lah, not magic.
  
  Last time I went to 7-eleven bought ice-cream, there also came out with this plastic spoon, when u dip into the cold ice-cream, the spoon will change color.
  
  

  When is the last time?
• toyota-corolla

  20 Jun 07, 18:30

  i remember. a straw that only appear colour when you dip into ice water right?
  
  if that's the case. is bout 8 years ago.
• eviljustice

  20 Jun 07, 18:34

  got meh? i think is smth like those neon light bar litdat lor. maybe u can start searchin from there.
• silvercap

  20 Jun 07, 19:06

  Originally posted by Darkness_hacker99:

  When is the last time?

  4 months ago, near AMK bus interchange
• Deino

  20 Jun 07, 20:41

  there is this ring that changes colour when the temprature changes too.....
• Mr.BullShyt

  20 Jun 07, 20:45

  smlj where got learn these before...
• usck

  20 Jun 07, 21:55

  oh i rem this too, i got a hotwheels car that can change colour when put in fridge
• I_love_my_toilet

  20 Jun 07, 22:02

  wah lau toothbrush oso got leh
  
  even the BK spider man toy oso got leh
  
  but i dunno wat material thou
• DC+

  20 Jun 07, 22:08

  its a thermal reaction. But repeated enough, the changes can be permanent ....colour stays permanent.
• Crystal_Dumpling

  20 Jun 07, 22:10

  Is it the reversible reaction those type?
  
  Like one direction is exothermic, the other is endothermic, hence like that?
  
  Or is it due to chemical changes? But can't be right? How to have Fe2+ and Fe3+ on such personal items? Or even KMnO4 O_O
• silvercap

  22 Jun 07, 00:48

  Originally posted by I_love_my_toilet:

  wah lau toothbrush oso got leh
  
  even the BK spider man toy oso got leh
  
  but i dunno wat material thou

  yap, that's the one.
  I was wonder where can I get this type of chemical.
  
  
• UnheardUnknown

  22 Jun 07, 10:43

  I think it has got to do with oxidation and reduction
• mochou

  22 Jun 07, 11:04

  Try searching for:
  thermochromism
  Halochromism
  
  hope it helps.