A standard bottle of ink in appearance.

It is reactive to cold & heat, and the writers conscious thought. This ink can be useful for those wishing to send concealed messages.

Usage - Colour

• The user of the ink simply has to think of what particular colour the ink will be when in it's visible state once used to write or draw.
• The colour of the ink cannot be changed once applied to a surface.

Usage - Thermal

• When the ink is exposed to heat in close proximity, it will turn invisible.
• When exposed to cold in close proximity, it will turn visible.
• The ink is either fully visible or fully invisible, only changing state when the prescribed conditions are applied to the ink.
• The thermatic properties of the ink only apply to used dry ink (IE, an implement has applied it to a surface from the bottle).
• The Ink's heat reactive temperature is half that required to set paper or parchment alight.
• The Ink's cold reactive temperature is half that required to freeze an object.

Other notes

• If anything written or drawn on using Thermochromatic Ink is spoiled by rain or water, the ink will run, ruining any message, sign or symbol written or drawn regardless of it's state of visibility.
• The unused wet ink in the bottle always remains black and visible.
  
  
  

Notes: Creation, Communication, Deception, Consumable