for more than 30 years, qc corporation & its affiliate company add-iron corporation, has been north america's leading processor of dried ferrous sulfate. **qc corporation began ferrous sulfate drying operations in baltimore, md in 1971. in 1981, we moved to cape girardeau, missouri to meet anticipated growth & reduce transportation costs. our 140,000 sq. ft. production & warehouse facility has undergone 5 expansions since its startup. add-iron corporation's 96,000-sq. ft. production facility was built in 1996 in north lima, ohio, to satisfy expanding markets & our customers in the eastern regions of canada & the united states. rail or truck can make shipments from both locations. **processing equipment for the production of diamond brand custom formulated micronutrients was added at cape girardeau, missouri in 2000. qc produces on a tolling or contract manufacturing basis customized granulated micronutrient combinations and other products to meet specific customer specifications. **