Ink composition for sensing carbon dioxside gas, carbon dioxside indicator using the same, package provided with the carbon dioxside indicator, and method for sensing pinhole using the same

A carbon dioxide indicator comprising a support and an indicating portion formed using an ink composition for sensing carbon dioxide gas, which contains a pH indicator, binder, and solvent.

A package comprising:

• an outer package, inner atmosphere of which contains a carbon dioxide gas;
• and a carbon dioxide indicator placed in said outer package, including a support and an indicating portion formed using an ink composition for sensing carbon dioxide gas, containing a pH indicator, binder, and solvent.

A pinhole sensing method comprising:

• forming a package by placing, in a carbon-dioxide-impermeable outer package, inner atmosphere of which containing a carbon dioxide, a carbon dioxide sensing indicator having a support and an indicating portion formed using a carbon dioxide sensing ink composition containing a pH indicator, binder, and solvent;
• and sensing the formation of a pinhole in the package in accordance with the color of the indicating portion.