Removing Iodine Stains From Terrazzo Floors

Procedure code:
940009S
Source:
Developed For Hspg (Nps - Sero)
Division:
Finishes
Section:
Terrazzo
Last Modified:
03/13/2017

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

 

Last Reviewed 2017-03-13