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Tools and Materials for Gravestone
Cleaning Projects
by Fannin Lehner Preservation Consultants
STONE TYPES
Marble and Limestone
Water
Non-ionic Detergent (Photo-Flo-Kodak product)
Household Ammonia (Requires water hose for rinsing and
Hydrion Paper test strips for pH testing.)
Calcium Hypochlorite (HTH) for biological growth
retardation. (Requires water hose for rinsing and
Hydrion Paper test strips for pH testing.)
Slate and Other Stone
Water
Non-ionic Detergent (Photo-Flo-Kodak product)
GENERAL CLEANING
Good water supply
Non-ionic Detergent (Photo-Flo--Kodak product).
1/4 oz./5quarts water
Ammonia--1 cup/1gal. water (for marble only)
Calcium Hypochlorite (granular)-2 oz. dry/1 gal. warm
water
Assortment of brushes (NOT WIRE) of varying stiffness.
Toothbrushes (firm), sponges
Scrapers- craft sticks, plastic scrapers
POULTICE--SOFTENING
Kaolin/porcelain clay (dry),
Glycerine (use 50/50 mixture with water)
Water
Saran Wrap and heavy plastic for wrapping
Tape/ string to secure plastic
Scrapers- plastic and wood
CLEANING DON'TS
Wire brushes, metal instruments, abrasive pads (Scotchbrite,
Brillo, Steel wool)
Acid or acidic cleaners (especially on marble or
limestone!) (Should only be used by conservators with
proper training on non-calcareous stone)
Household cleaners: soap (Ivory), detergents (liquid or
powder), Borax, Clorox, TSP, Calgon, Fantastik, Formula
409, Spic and Span (or any other abrasive cleaner)
REMEMBER: The use of improper cleaning materials and
practices can cause serious and irreparable damage to
gravestones! Make sure the stone is stable before
attempting to clean it - no flaking, delaminating, etc.
See Preservation for information on how to cast a new
base for a broken gravestone, and several other
frequently asked questions. |
