TAXIING INTO RAMP ON RAINY NIGHT; RPTR ACFT HIT ANOTHER ACFT WINGTIP WHILE UNDER TAXI GUIDANCE BY GND MARSHALLER.

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WHILE TAXIING IN; IT WAS RAINING AND DARK. UPON ENTERING THE RAMP AREA WE SAW NO VEHICLE TO PARK US. I FLASHED THE LNDG LIGHTS AND A VAN CAME OUT AND DIRECTED US TO THE FAR SIDE OF THE PARKING AREA. AS WE CONTINUED TO TAXI BOTH PLTS WERE WATCHING EACH SIDE; THE WINDSHIELD WIPERS WERE BEING USED. AS WE PROGRESSED FURTHER I LOOKED TO THE SIDE AND REAR; I SAW THE BOEING AND OUR WING AND WAS SURE IT WAS CLR. AS WE CONTINUED WE FELT; WHAT WAS OUR FIRST IMPRESSION; WHAT WE FIRST THOUGHT WAS RUNNING OVER A CHOCK. I STOPPED AND WE LOOKED TO BOTH SIDES AND TO THE REAR. WITH THE WATER ON THE SIDE WINDOWS AND DARKNESS WE COULD NOT SEE ANYTHING; SO WE CONTINUED TO THE PARKING SPACE. UPON SHUTDOWN AND INVESTIGATION WE LEARNED THAT WE HAD STRUCK THE BOEING. THE DAMAGE TO OUR ACFT WAS ONLY COSMETIC. IT APPEARED THAT OTHER ACFT WINGTIP WILL NEED REPLACEMENT. WHEN WATER (RAIN) IS PRESENT PAINT STRIPES ON THE GND CAN DISAPPEAR. WOULD A REFLECTIVE PAINT (GLASS) OR THE CTRLINE REFLECTORS BE OF BENEFIT. WATER ON THE SIDE WINDOWS CUT VISIBILITY GREATLY.