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• 5. If using the same material is not technically or economically <br />feasible then compatible substitute materials may be <br />considered. <br />6. Cleaning of metal elements either to remove corrosion or <br />deteriorated paint shall use the mildest method possible. <br />7. Abrasive cleaning methods, such as low pressure dry grit <br />blasting, may be allowed as long as it does not abrade or <br />damage the surface. <br />8. A test patch of the cleaning method(s) shall be reviewed and <br />approved on site by staff of the Historic Preservation <br />Commission of South Bend and St. Joseph County. Test <br />patches should always be carried out well in advance of <br />cleaning (including exposure to all seasons if possible). <br />9. Cleaning to remove corrosion and paint removal should be <br />considered only where there is deterioration and as part of an <br />overall maintenance program which involves repainting or <br />applying other appropriate protective coatings. Paint or other <br />coatings help retard the corrosion rate of the metal. Leaving <br />the metal bare will expose the surface to accelerated <br />corrosion. <br />• 10. Repainting should be based on paint seriation studies. If an <br />adequate record does not exist repainting shall be done with <br />colors that are appropriate to the style and period of the <br />building. <br />The Landscapes - Specific Standard and Criteria was financed in part with <br />funds from the National Park Service, U.S. Department of the Interior, <br />through the Massachusetts Historical Commission, Secretary of State <br />Michael Joseph Connolly, Chairman, and adopted for use by the Historic <br />Preservation Commission of South Bend and St. Joseph County, Indiana, by <br />permission of the Environment Department, City of Boston, Massachusetts, <br />by Michael A. Cannizzo, Staff Architect, 1996. <br />• 18 <br />