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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 />