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5. If using the same material is not technically or economically feasible, then <br /> compatible substitute materials may be considered. <br /> 6. Cleaning of metal elements either to remove corrosion or deteriorated <br /> paint shall use the mildest method possible. <br /> 7. Abrasive cleaning methods, such as low pressure dry grit blasting, may be <br /> allowed as long as it does not abrade or damage the surface. <br /> 8. A test patch of the cleaning method(s) shall be reviewed and approved on <br /> site by staff of the Boston Landmarks Commission. Test patches should <br /> always be carried out well in advance of cleaning (including exposure to <br /> all seasons if possible). <br /> 9. Cleaning to remove corrosion and paint removal should be considered <br /> only where there is deterioration and as part of an overall maintenance <br /> program which involves repainting or applying other appropriate <br /> protective coatings. Paint or other coatings help retard the corrosion rate <br /> of the metal. Leaving the metal bare will expose the surface to accelerated <br /> corrosion. <br /> 10. Repainting should be based on paint seriation studies. If an adequate <br /> record does not exist repainting shall be done with colors that are <br /> appropriate to the style and period of the building. <br /> The Landscapes-Specific Standards and Criteria has been financed in part with funds from the National Park Service, <br /> U.S.Department of the Interior,through the Massachusetts Historical Commission.Secretary of State Michael Joseph <br /> Connolly,Chairman. <br /> The U.S.Department of the Interior prohibits discrimination on the basis of race,color.national origin,age,gender,or <br /> handicap in its federally assisted programs. If you believe you have been discriminated against in any program,activity <br /> or facility as described above,or if you desire further information,please write to:Office for Equal Opportunity, 1849 <br /> C Street NW,Room 1324,U.S.Department of the Interior,Washington,D.C.20240. <br />