Fat, Oil Red O, Propylene Glycol Stain Kit

fat stain kit oil red o propylene glycol

Product Options:

Part # 9119A250ml kit $188.50



    Part 9119A
Solution A: Propylene Glycol 100%, ACS 250 ml
Solution B: Oil Red O Stain, Propylene Glycol 250 ml
Solution C: Propylene Glycol 85%, Aqueous 250 ml
Solution D: Hematoxylin Stain, Mayer Modified 250 ml

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

Additionally Needed:

Formalin 10%, Phosphate Buffered Part 1090

Lithium Carbonate, Saturated Aqueous


Scott Tap Water Substitute

Part 12215


Part 1380

Mount-Quick Aqueous Part 6271A


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



Newcomer Supply Fat, Oil Red O, Propylene Glycol Stain Kit procedure is classified as a physical staining method and is used for identification of fat/lipid in frozen sections. 



Fixation:   Fresh tissue or formalin fixed unprocessed tissue (See Procedure Note #1)

Technique:   Frozen sections cut at 8-10 microns mounted on adhesive slides

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. Fix frozen section slides in Formalin 10%, Phosphate Buffered (Part 1090) for 1 minute.
  1. See Procedure Note #2.
  1. Rinse sections carefully in two changes of distilled water.
  2. Blot off excess water and place slides in Solution A: Propylene Glycol 100%, ACS for 2-5 minutes.
  3. Place slides directly into Solution B: Oil Red O Stain, Propylene Glycol for 1 hour.  Agitate occasionally or place Coplin jar on rotator/shaker with continuous gentle agitation.
  1. See Procedure Notes #3 and #4.
  1. Differentiate in Solution C: Propylene Glycol 85%, Aqueous with agitation for a minimum of 3 minutes.
  2. Rinse gently in two changes of distilled water.
  3. Counterstain with Solution D: Hematoxylin Stain, Mayer Modified, for 2-3 minutes, depending on preference of nuclear stain intensity.
  4. Wash gently in several changes of tap water.
  5. Blue slides in Lithium Carbonate, Saturated Aqueous (Part 12215) or Scott Tap Water Substitute (Part 1380) for 10 dips.
  1. See Procedure Note #5.
  1. Wash gently in several changes of tap water.
  2. Blot excess water from slide; coverslip with Mount-Quick Aqueous (Part 6271A) mounting medium.
  1. See Procedure Note #6.



Fat Bright red
Nuclei Blue to dark blue



  1. To freeze formalin fixed unprocessed tissue post-fixation: Place specimen in tissue cassette, wash in running water for 5 minutes. Remove tissue from cassette and blot well removing all excess water from tissue. Freeze tissue (fresh or formalin fixed) according to your laboratory protocol.
  2. Frozen formalin fixed tissue does not require an additional formalin fixation step.
  3. To decrease staining time; preheat Solution B: Oil Red O Stain, Propylene Glycol in a 60°C oven and decrease incubation time to 7-10 minutes.
  4. If a filmy precipitate develops in Solution B: Oil Red O Stain, Propylene Glycol filter with coarse filter paper.
  5. The use of a bluing agent in this procedure is an optional step.
  6. Use minimal pressure when applying coverslip or fat/lipid staining may be disturbed.  To remove trapped air bubbles under coverslip; soak slide in warm water until coverslip can easily be removed. Blot excess water from slide and remount with new coverslip and Mount-Quick Aqueous mounting medium.



  1. Carson, Freida L., and Christa Hladik. Histotechnology: A Self-Instructional Text. 3rd ed. Chicago, Ill.: American Society of Clinical Pathologists, 2009. 184-186.
  2. Prophet, Edna B., Bob Mills, Jacquelyn Arrington, and Leslie Sobin. Laboratory Methods in Histotechnology. Washington, D.C.: American Registry of Pathology. 1992.178.
  3. Sheehan, Dezna C., and Barbara B. Hrapchak. Theory and Practice of Histotechnology. 2nd ed. St. Louis: Mosby, 1980. 205.
  4. Modifications developed by Newcomer Supply Laboratory.