Ink used in inkjet recording, method for inkjet recording, inkjet recording head and manufacturing method therefor, method for treating inkjet recording head, and inkjet printer
   
   

A surface treating solution use in thermal inkjet recording contains a organic phosphonic compound represented by the formula: ##STR1## The inkjet recording head is treated with the organic phosphonic compound represented by formula (1) so that the surface of a heater device of the inkjet recording head is treated with the organic phosphonic compound represented by formula (1).

 
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