Fungus, PAS/Light Green Stain Kit

fungus stain kit pas light green

Updated Procedure:
  • Incorporated working 0.1% light green.

Product Options:

Part # 9122A250ml kit $147.40




    Part 9122A
Solution A: Periodic Acid 0.5%, Aqueous 250 ml
Solution B: Schiff Reagent, McManus 250 ml
Solution C: Light Green SF Yellowish Stain 0.1%, Aqueous 250 ml


COMPLIMENTARY POSITIVE CONTROL SLIDES: Enclosed with this kit are two complimentary unstained positive control slides to be used for the initial verification of staining techniques and reagents.  Verification must be documented by running one Newcomer Supply complimentary positive control slide along with your current positive control slide for the first run. Retain the second complimentary control slide for further troubleshooting, if needed.

Individual stain solutions and additional control slides may be available for purchase under separate part numbers .

Additionally Needed:

Xylene, ACS Part 1445
Alcohol, Ethyl Denatured, 100% Part 10841
Alcohol, Ethyl Denatured, 95% Part 10842


For storage requirements and expiration date refer to individual bottle labels.



Newcomer Supply Fungus, PAS/Light Green Stain Kit procedure is used for identifying fungus and glycoproteins. Polysaccharides present in fungal cell walls are oxidized by the periodic acid to aldehydes. The aldehydes then react with Schiff Reagent, McManus to yield magenta colored fungi.



Fixation: Formalin 10%, Phosphate Buffered (Part 1090)

Technique:   Paraffin sections cut at 5 microns

Solutions:     All solutions manufactured by Newcomer Supply, Inc.

All Newcomer Supply Stain Kits are designed to be used with Coplin jars filled to 40 ml following the staining procedure provided below.  Some solutions in the kit may contain extra volumes.



  1. Deparaffinize sections thoroughly in three changes of xylene, 3 minutes each.  Hydrate through two changes each of 100% and 95% ethyl alcohols, 10 dips each.  Wash well with distilled water.
  1. See Procedure Notes #1 and #2.
  1. Place slides in Solution A: Periodic Acid 0.5%, Aqueous for 5 minutes.
  2. Wash in three changes of tap water; rinse in distilled water.
  3. Drain slides of excess water and stain in Solution B: Schiff Reagent, McManus for 20 minutes.
  4. Wash gently in lukewarm tap water for 10 minutes to allow pink color to develop.
  5. Counterstain in Solution C:  Light Green SF Yellowish Stain 0.1%, Aqueous for 5 seconds.
  1. See Procedure Note #3.
  1. Dehydrate in two changes each of 95% and 100% ethyl alcohol. Clear in three changes of xylene, 10 dips each; coverslip with compatible mounting medium.  



Fungal cell walls and glycogen  Red to magenta
Background Pale green



  1. Drain staining rack/slides after each step to prevent solution carry over.
  2. Do not allow sections to dry out at any point during staining procedure.
  3. Increase or decrease staining time in Solution C: Light Green SF Yellowish Stain 0.1%, Aqueous for a length of time to suit your preference of counterstain intensity.
  4. Newcomer Supply Schiff Reagent, McManus is stored at room temperature.  There is no benefit to store this product at 4°C.
  5. If using a xylene substitute, closely follow the manufacturer’s recommendations for deparaffinization and clearing steps.



  1. Bancroft, John D., and Marilyn Gamble. Theory and Practice of Histological Techniques. 6th ed. Oxford: Churchill Livingstone Elsevier, 2008. 321-323.
  2. Sheehan, Dezna C., and Barbara B. Hrapchak. Theory and Practice of Histotechnology. 2nd ed. St. Louis: Mosby, 1980. 245.
  3. Modifications developed by Newcomer Supply Laboratory.