Removing Iodine Stains From Terrazzo Floors
- Procedure code:
- Developed For Hspg (Nps - Sero)
- Last Modified:
REMOVING IODINE STAINS FROM TERRAZZO FLOORS
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
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).
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.
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.
Talcum Powder: Available from drugstore or
pharmaceutical supply distributor.
A. Wooden Paddle or Trowel
B. Shallow Enameled Pan
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
A. An iodine stain will gradually disappear without
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
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.