What's the difference between red inkpad and blue inkpad?

The difference between red inkpad and blue inkpad is that:

1, different colors:

1 blue.

② Red.

2, different uses:

(1) general domestic official seal with red inkpad,

(2) Foreign official seal with blue inkpad.

(3) The signature is generally blue inkpad.

(4) Internal data storage and numbering generally use blue inkpad.