WE HAVE DEVELOPED A SPECIAL SOLDER BAR CALLED 'ECONOMICAL SOLDER' BY SELECTING THE RIGHT COMPOSITION AND INTRODUCING A SPECIAL TREATMENT, WHICH IS GIVEN AT THE TIME OF MANUFACTURING. IN COMMON SOLDER BARS, OXIDES CAN BUILD UP ON THE SURFACE OF MOLTEN SOLDER, TO A BROWNISH BLACK MASS CALLED DROSS. ON PASSAGE OF TIME, THE SURFACE, OF 'BOND' ECONOMICAL SOLER BECOMES GLOSSY IN APPEARANCE FOR A LONGER TIME. THE RESULT IS LESS DROSS FORMATION ON THE SURFACE THAT MAKES IT ECONOMICAL TOOL.