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Historic Preservation - Technical Procedures

Spectitle:

Removing Iodine Stains From Terrazzo Floors

Procedure code:

0940009R

Source:

Developed For Hspg (Nps - Sero)

Division:

Finishes

Section:

Terrazzo

Last Modified:

02/24/2012

Details:

Removing Iodine Stains From Terrazzo Floors



REMOVING IODINE STAINS FROM TERRAZZO FLOORS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing iodine
         stains from terrazzo floors.  

    B.   Iodine is a nonmetallic element used especially in
         medicine, photography and analysis.

    C.   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).


PART 2---PRODUCTS

2.01 MATERIALS

    NOTE:  Chemical products are sometimes sold under a common
    name.  This usually means that the substance is not as pure as
    the same chemical sold under its chemical name.  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.  Common
    names are indicated below by an asterisk (*).

    A.   Rubbing* or Isopropyl Alcohol (C3H8O):

         1.   A volatile flammable alcohol used especially as a
              solvent and rubbing alcohol.

         2.   Other chemical or common names include Dimethyl
              carbinol; Isopropanol; 2-propanol.

         3.   Available from chemical supply house, dry cleaning
              supply distributor, drug store, hardware store,
              paint store or printer's supply distributor.

    B.   Whiting:

         CAUTION:  DO NOT USE WHITING WITH ACID (SUCH AS IN A
         POULTICE), AS WHITING IS A CARBONATE AND REACTS WITH ACID
         TO PRODUCE CARBON DIOXIDE.  THIS REACTION IS NOT
         DANGEROUS; HOWEVER, THE COMBINATION RENDERS THE ACID
         INEFFECTIVE AND PRODUCES A FOAMY MESS.

         1.   Other chemical or common names include Powdered
              chalk.  Kitchen flour may also be substituted.

         2.   Available from paint store.

         -0R-

         Talcum Powder:  Available from drugstore or
         pharmaceutical supply distributor.

2.02 EQUIPMENT

    A.   Wooden Paddle or Trowel

    B.   Shallow Enameled Pan


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Examine the terrazzo surface carefully to determine the
         cause of staining.  Eliminate cause before proceeding
         with any cleaning operation.

3.02 ERECTION, INSTALLATION, APPLICATION

    NOTE:  THE FOLLOWING TREATMENTS SHOULD BE USED BY TRAINED AND
    EXPERIENCED PERSONNEL.  IMPROPER USE MAY RESULT IN BLEACHING
    THE TERRAZZO MATRIX IF A COLOR DYE WAS ADDED AT THE TIME OF
    INSTALLATION.

    A.   An iodine stain will gradually disappear without
         treatment.

    B.   For quick removal, apply alcohol and cover it with
         whiting or talcum powder.

    C.   If the stain occurs on a vertical surface, talcum should
         be mixed with alcohol to form a paste.  Alcohol is first
         applied to the stain, and it is then covered with the
         paste.

    D.   Remove dried paste with wooden spatula.

    E.   Rinse thoroughly with clean, clear water and repeat the
         process as required until stain is no longer noticeable.

                             END OF SECTION