MATERIAL SAFETY DATA SHEET

                                     LaMotte Company

                       P.O. Box 329 - Chestertown, Maryland 21620

                        Telephone for Information - 410-778-3100



                24 Hour Emergency Number (CHEM-TEL): 800-255-3924

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 1.   PRODUCT IDENTIFICATION

      Name: Thymol Blue Indicator

      Code #: 2213



 2.   HAZARDOUS INGREDIENTS

      1. May contain either of

      2. the following for adjustment of initial pH:

      3. Hydrochloric acid

      4. Sodium Hydroxide



           CAS #                %            PEL

      1.

      2.

      3.   7647-01-0            <0.1         C7         mg/cubic m

      4.   1310-73-2            <0.1         2          mg/cubic m



           TLV

      1.

      2.

      3.   C5           ppm

      4.   2            mg/cubic m



 3.   NON-HAZARDOUS INGREDIENTS

      1. Thymol Blue

      2. Water to 100%



           CAS #                %

      1.   76-61-9              <0.1

      2.   7732-18-5



 4.  PHYSICAL DATA

      Appearance: , Varies, amber to blue, Liquid

      Odor: None

      Solubility in Water: Soluble             pH: 7.5 - 9

      Boiling Point: ca. 100 degC              Melting Point: N/A

      Vapor Pressure (mmHG): <17 @ 20 deg C    Vapor Density (Air=1):<1

(Air=1)



 5.   FIRE & EXPLOSION DATA

      Flash Point (Method Used): N/A

      Flammable Limit: LEL: N/A          UEL: N/A

      Extinguishing Media: Not a fire hazard

      HMIS Hazard: Health 0   Flammability 0   Reactivity 0

        (Scale: 4=Extreme, 3=High, 2=Moderate, 1=Slight, 0=Least)

      Special Fire Fighting Procedures: N/A

      Unusual Fire & Explosion Hazard: N/A





 6.   REACTIVITY DATA

      Stability: Stable [Y] Unstable [N]

      Conditions to Avoid: Temperature extremes

      Incompatibility (Materials to Avoid): N/A

      Hazardous Decomposition Products: N/A





 7.  HEALTH HAZARD DATA

     Toxicity: Non-toxic

     Primary Route of Entry: Inhalation [N] Skin [Y] Ingestion [N]

N/A [N]

     Target Organ:

          Central Nervous System [N] Teeth and Skeleton [N]

          All Body Organs [N]     Pituitary [N]    Bone Marrow [N]

                GI System [N]       Kidneys [N]        Thyroid [N]

                     Liver [N]      Bladder [N]          Lungs [N]

                   Unknown [N]        Brain [N]          Blood [N]

                     Heart [N]         Eyes [N]           Skin [N]



      Signs & Symptoms of Exposure: May stain skin.

      Medical Condition Aggravated by Exposure: N/A

      Carcinogenicity: N/A [Y] NTP [N]              IARC [N]      OSHA [N]





 8.   EMERGENCY FIRST AID    PROCEDURES

      Eye Contact: Flush     thoroughly with water. Consult physician.

      Skin Contact: Flush    with water. Wash skin with soap and water.

      Ingestion:    Drink    water. Consult physician.

      Inhalation:   N/A



 9.  SPILL & DISPOSAL PROCEDURES

     Spill and Leak: Mop up and flush to drain with water.

     Disposal:       Flush down drain with excess water. Dispose

according to

                     federal, state and local regulations.





10.  PRECAUTIONARY MEASURES

     In Handling: Eye Protection [Y]

                   Gloves [N]

                   Other [Y]             Lab Coat

     Ventilation: Respiratory Protection [N]

                   Mechanical [N]

                   Normal [Y]

     Use with Adequate Ventilation Only: [N]

     Work/Hygienic Practices: Avoid prolonged or repeated contact with

skin or

                               clothing.



11.   SPECIAL PRECAUTIONS:     N/A



      Prepared By:   I.Penfield                    Date:   05/12/2000