Removing Ink Stains From Terrazzo Floors

Procedure code:
940001S
Source:
Developed For Hspg (Nps - Sero)
Division:
Finishes
Section:
Terrazzo
Last Modified:
03/13/2017

 

PART 1---GENERAL

REMOVING INK STAINS FROM TERRAZZO FLOORS

1.01 SUMMARY

 

    A.   This procedure includes guidance on removing ink stains

         from terrazzo floors.

 

    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 general information on the characteristics and

         maintenance of terrazzo, see 09400-01-P.

 

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.   For Ordinary Ink Stains:

 

         1.   Sodium Perborate:

 

              a.   Other chemical or common names include

                   Perborax*.

 

              b.   Potential Hazards:  TOXIC AND FLAMMABLE (WHEN

                   IN CONTACT WITH ORGANIC SOLVENTS).

 

              c.   Available from chemical supply house,

                   drugstore or pharmaceutical supply

                   distributor, grocery store or supermarket.

 

         2.   Hot water

 

         3.   Whiting:

 

              a.   Other chemical or common names include

                   Powdered chalk.  Kitchen flour may also be

                   substituted.

 

              b.   Available from paint store.

 

    B.   For Bright-Colored Ink Stains:

 

         1.   Ammonia water:

 

              CAUTION:  DO NOT MIX AMMONIA WITH CHLORINE

              BLEACHES, A POISONOUS GAS WILL RESULT!  DO NOT USE

              BLEACH ON BIRD DROPPINGS.

 

              a.   A weakly basic compound that is formed when

                   ammonia dissolves in water and that exists

                   only in solution.

 

              b.   Other chemical or common names include

                   Ammonium Hydroxide; Aqua ammonia*; Household

                   ammonia*.

 

              c.   Potential hazards:  TOXIC; MAY IRRITATE THE

                   EYES.

 

              d.   Available from chemical supply house, grocery

                   store or pharmaceutical supply distributor, or

                   hardware store.

 

         2.   Cotton batting

 

         3.   Javelle water (Made by user). See 03710-02-S for

              materials, equipment and procedures for preparing

              Javelle Water.

 

    C.   For Blue Ink and Indelible Ink Stains:  

 

         1.   Ammonia water (see Section 2.01 B.1. above)

 

         2.   Cotton batting or cotton gauze

 

2.02 EQUIPMENT

 

    A.   Wooden Paddle or Trowel

 

    B.   Stoneware Jar

 

    C.   Shallow Enameled Pan

 

    D.   Electric or battery powered scrubbing machines

 

 

PART 3---EXECUTION

3.01 EXAMINATION

 

    A.   Examine the terrazzo surface carefully to determine the

         cause of staining 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.   For Ordinary Writing Inks:

 

         1.   Make a strong solution of sodium perborate in hot

              water and mix with whiting to form a thick paste.

 

         2.   Thoroughly wet the surface to be treated with

              clean, clear water.

 

         3.   Apply the mixture to the stained area in a 1/4 inch

              thick layer using a wood or plastic spatula and

              allow to dry.  Be sure to spread the poultice well

              beyond the stained area.  The liquid portion of the

              paste will migrate into the masonry where it will

              dissolve some of the staining material.  Then the

              liquid will gradually move back beyond the masonry

              surface and into the poultice, where it will

              evaporate, leaving the dissolved staining material

              in the poultice.

 

         4.   When the poultice has dried, brush or scrape it off

              with a wooden scraper.  

 

         5.   Using a stiff bristle brush, scrub the surface with

              scouring powder and clean water to remove any

              residual staining.

 

         6.   Thoroughly rinse the area with clean, clear water

              and blot dry with clean towels.

 

    B.   For Bright-colored Inks:

 

         1.   Use a sodium perborate poultice as described in

              Section 3.02 A. above.

 

         -OR-

 

              Saturate cotton batting in ammonia water.  

 

         -OR-

 

              Saturate cotton batting in javelle water (see

              03710-02-S for procedures on preparing Javelle

              Water) and mix with whiting to form a thick paste.

             

         -OR-

 

              Mix equal parts of chlorinated lime and whiting

              reduced to a paste with water.

 

         2.   Follow poultice preparation and application

              procedures described above in Section 3.02 A.2-7.

              Repeat the treatment as necessary to achieve the

              desired level of cleanliness.

 

    C.   For Blue Inks:  Some blue ink stains cannot be removed by

         the perborate poultice, Javelle water, or chlorinated

         lime poultice.

 

         1.   Saturate cotton batting in ammonia water.

 

              -OR-

 

              Use a strong soap solution in place of ammonia

              water.

 

         2.   Follow poultice preparation and application

              procedures described above in Section 3.02 A.2-7.

              Repeat the treatment as necessary to achieve the

              desired level of cleanliness.

 

    D.   For Indelible Inks:

 

         1.   Treat the same as blue ink stains.

 

         2.   For more difficult stains such as inks containing

              silver salts (causing a black stain), saturate

              ammonia water in cotton gauze.

 

         3.   Follow poultice preparation and application

              procedures described above in Section 3.02 A.2-7.

              Repeat the treatment as necessary to achieve the

              desired level of cleanliness.

 

                             END OF SECTION

 

Last Reviewed 2017-03-13