Skip to main content

Modified Yellowsolve for General Oversight

Modified Yellowsolve

for General Oversight



  • Hemalum
  • Trichlorethylene
  • Solution A
    Phloxine B0.5g
    Calcium chloride0.5g
    Distilled water100mL
  • Solution B
    Luxine pure yellowtosaturation
    Ethyl phosphate50mL

Tissue Sample

5 µ paraffin sections of neutral buffered formalin fixed tissue are likely suitable. It should be noted, however, that the authors of this method favoured extended fixation in formal sublimate of up to 10 days for fibrin. This fixative is now deprecated due to its mercuric chloride content. With other staining methods, pretreatment of sections with Bouin’s fluid for an hour at 60°C can compensate for the lack of mercury fixation to a large degree.

Lendrum says, “If … the time of differentiation is kept short the result is comparable to the best examples of the old Masson’s erythrosin-saffron technique.” Masson’s erythrosin-saffron is the same technique as the HPS (hematoxylin-phloxine-saffron) using phloxine instead of erythrosin.


  1. Dewax sections with xylene.
  2. Place in trichlorethylene for 24 to 48 hours.
  3. Bring sections to water.
  4. Stain nuclei with hemalum, differentiate and blue.
  5. Wash well with water.
  6. Place in solution A for 30 minutes.
  7. Rinse with 2-ethoxyethanol.
  8. Differentiate with solution B, controlling microscopically, until collagen is yellow.
  9. Rinse with 2-ethoxyethanol.
  10. Clear in xylene and mount with a synthetic resinous medium.

Expected Results

  • Nuclei  –  blue
  • Muscle  –  red
  • Background  –  yellow


  • Stop differentiation when collagen is yellow and muscle is still red.
  • 2-Ethoxyethanol is also known as cellosolve or ethylene glycol monoethyl ether, and has the formula CH3CH2OCH2CH2OH.
  • Trichlorethylene has the formula ClHC=CCl2 or C2HCl3
  • Trichlorethylene should be used in a fume hood.

Safety Note

Prior to handling any chemical, consult the Safety Data Sheet (SDS) for proper handling and safety precautions.


  1. Lendrum A C, Fraser D S, Slidders W and Henderson R. (1962)
    Studies on the character and staining of fibrin.
    Journal of clinical pathology, v. 15, p. 401.