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Historic Preservation - Technical Procedures

Spectitle:

Removing Iodine Stains From Marble

Procedure code:

0445516R

Source:

Developed For Hspg (Nps - Sero)

Division:

Masonry

Section:

Marble

Last Modified:

12/17/2014

Details:

Removing Iodine Stains From Marble



REMOVING IODINE STAINS FROM MARBLE


THE CLEANING OR REMOVAL OF STAINS FROM STONE MAY INVOLVE THE USE
OF LIQUIDS, DETERGENTS OR SOLVENTS WHICH MAY RUN OFF ON ADJACENT
MATERIAL, DISCOLOR THE STONE OR DRIVE THE STAINS DEEPER INTO POROUS
STONES.  USE THE PRODUCTS AND TECHNIQUES DESCRIBED HERE ONLY FOR
THE COMBINATIONS OF DIRT/STAIN AND STONE SPECIFIED.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing iodine
         stains from marble with an alcohol poultice.

    B.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure.  These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         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).

    C.   For additional information on poulticing, see 04455-02-R.

    D.   For general information on the characteristics, uses and
         problems associated with marble, see 04455-01-S.


PART 2---PRODUCTS

2.01 MATERIALS

    NOTE:  When the common name of a chemical is used on the
    label, it is usually a sign that the substance is not as pure
    as the same chemical sold under its chemical name.  However,
    the grade of purity of the common-name substance is almost
    certain to be adequate for stain removal work, and because it
    is likely to be less expensive, the common-name product should
    be purchased when available.  Common names are indicated by an
    asterisk (*).

    A.   Denatured Alcohol:

         1.   Other chemical or common names include Methylated
              spirit*.

         2.   Potential hazards:  TOXIC AND FLAMMABLE.

         3.   Available from hardware store, paint store or
              printer's supply distributor.

         4.   Denatured alcohol, which carries no liquor tax,
              should be a satisfactory substitute for ethyl
              alcohol for stain removing purposes.

    B.   White absorbent material (molding plaster, untreated
         white flour, white tissue, paper towels, powdered chalk,
         talc, fullers earth or laundry whiting)

    C.   Mineral water

    D.   Plastic sheeting

    E.   Clean dry towels for blotting the area after treatment

2.02 EQUIPMENT

    A.   Glass or ceramic container for mixing the solution

    B.   Wooden utensil for stirring the ingredients

    C.   Wood or plastic spatula

    D.   Masking tape


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Examine the marble surface CAREFULLY to determine the
         cause of staining before proceeding with any cleaning
         operation.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Iodine stains will normally disappear without treatment.

    B.   For quick removal, apply a poultice of denatured alcohol
         and whiting:

         1.   Thoroughly rinse the area to be treated with
              mineral water.

         2.   Pour the denatured alcohol in a glass or ceramic
              bowl.  Use an amount adequate to fully cover the
              affected area.

         3.   Thoroughly moisten the stained surface with this
              liquid.  Be sure to dampen well beyond the stain.

         4.   Mix the remaining liquid with the white absorbent
              material to form a paste the consistency of oatmeal
              or cake icing.  (Approximately one pound of paste
              is needed for every square foot of surface area to
              be treated.)

         5.   Using a wooden or plastic spatula, apply the paste
              to the stained surface in layers no more than 1/4
              inch thick.  The poultice should extend well beyond
              the stain to prevent forcing the stain into
              previously clean stone.

         6.   Check the coating for air pockets or voids.

         7.   Cover the poultice with plastic sheeting and seal
              with masking tape.

         8.   Let set for 48 hours (unless otherwise specified).

         9.   After set period, dampen the poultice with mineral
              water.

         10.  Remove the poultice with a wooden or plastic
              spatula to avoid scratching the surface.

         11.  Again, rinse the cleaned area with mineral water,
              blot with clean towels and allow the surface to
              dry.

         12.  Once the surface has dried completely, check for
              remaining residue and repeat the treatment if
              necessary.

                         END OF SECTION
 


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