AN EMB135 PLT REPORTS THE TXWY D7 HOLD SHORT LINES AT RWY 24L ARE PAINTED IN REVERSE INDICATING A HOLD IMMEDIATELY AFTER LNDG RWY 6R WHILE ENTERING TXWY D7.

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WHILE TAXIING TO RWY 24L AT CYYZ WE WERE CLRED TO CROSS RWY 24R ON TXWY D. WE THEN PROCEEDED TO HOLD SHORT OF RWY 24L ON TXWY D7 AT A CORRECTLY PAINTED HOLD SHORT MARKING. THE TOWER CTLR INDICATED THAT WE WERE IN THE WRONG SPOT AND SHOULD HAVE STOPPED AT AN INCORRECTLY PAINTED (BACKWARDS) HOLD SHORT MARKING BEHIND US. HE AGREED IT WAS PAINTED BACKWARDS BUT SAID THERE WERE FLASHING LIGHTS ASSOCIATED WITH IT. IT WAS DAYLIGHT AND THE LIGHTS WERE NOT OBVIOUS. RWY 24R IS UNDER CONSTRUCTION. THE CTLR SAID WE WERE IN THE CORRECT SPOT TO HOLD SHORT OF THE RWY SURFACE BUT WE WERE INFRINGING ON THE APCH. THERE WAS NO ILS HOLD SHORT MARKINGS. THE ATIS OR NOTAMS DID NOT SAY ANYTHING ABOUT THIS. ATC ADVISED US AFTER THE FACT.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE AND THE FO WORKED THIS TRIP FOR AN ENTIRE WEEK AND DID VERIFY THAT THE HOLD SHORT LINES ARE PAINTED BACKWARD. THE RPTR ALSO STATED THAT ATC IS NOW OCCASIONALLY WARNING PLTS ABOUT THE MARKINGS. HOWEVER THERE WAS NO NOTAM ABOUT THIS ERROR AND SOME PLTS ARE STILL BEING CAUTIONED AFTER THE FACT ABOUT CROSSING THE HOLD SHORT LINE.