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Historic Preservation - Technical Procedures

Spectitle:

General Method Of Cleaning Mankato Stone/Yellow Kasota Marble

Procedure code:

0445501P

Source:

Hsr - Federal Bldg/P.O., Wash, Dc - Bldg Conservation Tech

Division:

Masonry

Section:

Marble

Last Modified:

02/24/2012

Details:

General Method Of Cleaning Mankato Stone/Yellow Kasota Marble



GENERAL METHOD OF CLEANING MANKATO STONE/YELLOW KASOTA MARBLE


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on mild cleaning of
         interior Mankato stone surfaces such as baseboards,
         wainscoting, pilasters, door surrounds and cornices.

    B.   Mankato stone is also known as Yellow Kasota or Floridene
         Marble.

    C.   Yellow Vein Kasota Marble is warm to pale yellow in
         appearance and slightly streaked with thin dark markings.

    D.   Yellow Fleuri Kasota Marble is warm yellow and mottled by
         paler yellow.


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.   Sodium Tripolyphosphate:  

         1.   A crystalline salt (NA5P2010) used chiefly as a
              builder in soaps and detergents, as a sequestering
              agent and as a deflocculating agent.

         2.   Other chemical or common names include Penta-sodium
              Triphosphate.

         3.   Available from chemical supply house.

         4.   Used in the making of general cleansers,
              dishwashing liquids or laundry detergent; It is a
              chemical responsible for increasing the sudsing
              action in cleaners.  Depending on the amount added,
              it also conditions water, facilitates rinsing, aids
              in dispersion of soil and removes soap film from
              previous washings.

    B.   Clean, Potable Water

2.02 EQUIPMENT

    A.   Sponges

    B.   Chamois

    C.   Natural Bristle Brushes

    D.   Clean, Soft Cloths


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:  Protect all masonry and metal surfaces
         immediately adjacent to or below the area to be cleaned
         by covering with polyethylene sheeting.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Mix 5% sodium tripolyphosphate solution using warm water.

    B.   Apply the cleaning solution to the standing stone with a
         soft natural bristle brush working from the bottom of the
         wall up. Wash in small overlapping areas.

    C.   Rinse each cleaned area thoroughly with fresh clear water
         using sponges to remove traces of cleaner. Use clean
         chamois or clean soft cloths to dry and buff the surface
         and prevent streaking.

                         END OF SECTION