LGT WAS DEICED WITH THE WRONG FLUID FOR THE TYPE OF WX CONDITION.

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AFTER LNDG IN PIT FROM SEA; A PREFLT INSPECTION REVEALED THAT VERY LIGHT RAIN WAS FREEZING UPON CONTACT WITH THE COLD SOAKED WING BUT NOT ON THE FUSELAGE OR GND AND OTHER EQUIP. I RPTED THIS TO THE CAPT AND CONFIRMED IT UPON A SECOND CHK. THE TEMP WAS ABOVE FREEZING AND THE RAIN DID NOT APPEAR TO BE FREEZING IN NATURE NOR DID THE PREFLT ATIS RPT FREEZING RAIN OR DRIZZLE. THE FROZEN WATER DROPS ON THE COLD SOAKED WING DID; HOWEVER; GIVE CONCERN AND WE PROCEEDED TO THE DEICE PAD AT WHICH TIME 'TYPE I' FLUID WAS APPLIED AND THE APPROPRIATE RPT GIVEN. AFTER DEICING; WE PROCEEDED DIRECTLY TO THE RWY WITHOUT DELAY. DURING THE ENTIRE PROCESS; ANY RAIN CONDITION DID NOT APPEAR TO BE FREEZING IN NATURE (AND HONESTLY I AM IN DOUBT AS TO WHETHER IT EXISTED AT ALL FROM DEICING TO TKOF). I HAVE BEEN ADVISED; HOWEVER; THAT THE CONDITIONS WERE SUBSEQUENTLY RPTED TO BE FREEZING AND THAT 'TYPE II' FLUID SHOULD HAVE BEEN APPLIED. IT IS EVIDENT THAT I NEED A CLRER UNDERSTANDING OF THE MEANING OF LIGHT FREEZING RAIN/DRIZZLE.