![]() ![]() Other chemical or common names include Powdered chalk.Available from chemical supply house, grocery store or pharmaceutical supply distributor, or hardware store.Potential hazards: TOXIC MAY IRRITATE THE EYES.Other chemical or common names include Ammonium Hydroxide Ammonia water* Aqua ammonia*.Common names are indicated below by an asterisk (*).ĬAUTION: DO NOT MIX AMMONIA WITH CHLORINE BLEACHES, A POISONOUS GAS WILL RESULT! DO NOT USE BLEACH ON BIRD DROPPINGS. The grade of purity of common name substances, however, is usually adequate for stain removal work, and these products should be purchased when available, as they tend to be less expensive. This usually means that the substance is not as pure as the same chemical sold under its chemical name. NOTE: Chemical products are sometimes sold under a common name. These guidelines should be reviewed prior to performing this procedure and should be followed, when applicable, along with recommendations from the Regional Historic Preservation Officer (RHPO). General Protection (Surface and Surrounding).These guidelines cover the following sections: See "General Project Guidelines" for general project guidelines to be reviewed along with this procedure.Removal and reapplication of the lacquer, however, will not harm the brass surface. Lacquer protects the brass finish from deterioration, though some brilliance of its surface characteristics is sacrificed.Lacquered brass will usually last about 10 years and does NOT require frequent polishing.All polishing, however, removes some brass. Unfinished brass MUST be polished frequently in order to maintain its luster.Architectural brass hardware and trim is generally maintained in a highly polished, "bright" finish. Solid brass is more durable than brass-plate and, therefore, can withstand more rigorous methods of cleaning. Brass-plate is a thin layer of brass bonded to steel. For applying a protective coating to brass-plate or solid brass, see "Classifications Of Aluminum Cleaners".For removing patina or tarnish from solid brass, see "Removing Patina Or Tarnish From Solid Brass".For removing old lacquer or paint from solid brass or brass-plate, see "Removing Old Lacquer Or Paint From Solid Brass Or Brass-Plate".For cleaning and polishing solid brass, see "Cleaning and Polishing Solid Brass".For additional guidance relating to cleaning and maintaining brass, see the following procedures:.This procedure includes guidance on removing patina or tarnish from solid brass.Take special care to protect all adjacent materials, and do not use this procedure on metals other than those specified in the summary. The cleaning or stripping of metals may involve the use of abrasives, liquids or solvents which may splash or run off onto adjacent materials. Therefore, use caution, as excessive cleaning can remove the texture and finish of the metal. PREFACE: All cleaning removes some surface metal and patina. Method is the best alternative or compliant with current environmental regulations and safety standards. Serve as general guidelines and do not constitute a federal endorsement nor a determination that a product or Should only be applied under the guidance of a qualified preservation professional who can assess theĪpplicability of a procedure to a particular building, project or location. We’ve reviewed these procedures for general consistency with federal standardsįor rehabilitating historic buildings and provide them only as a reference. To serve as a resource, not a substitute, for specification development by a qualified preservation Or is compliant with current environmental regulations and safety standards. References to products and suppliers are to serve as a general guideline and do not constitute a federalĮndorsement or determination that a product or method is the best or most current alternative, remains available, All specifications require project-specificĮditing and professional judgement regarding the applicability of a procedure to a particular building, project or With the Secretary of Interior Standards for rehabilitating historic buildingsĪs understood at the time the procedure is added to the library. ![]() Prior to inclusion in GSA’s library of procedures, documents are reviewedīy one or more qualified preservation specialists for general consistency ![]()
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