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Electron Microscopy Sciences

Technical Data Sheets

Technovit H7100 / H8100 Acid Phosphatase

EMS Catalog # 14653-14654

Acid Phosphatase For Glycol Methacrylate Sections


  1. Incubate sections in the incubating medium at 37°C for five to 12 hours. Long incubation periods are needed to get significantly visible reaction product.
  2. Wash in distilled water for two minutes.
  3. Counterstain with Methyl Green for five minutes.
  4. Wash in distilled water for two minutes.
  5. Air dry and cover slip.


Nuclei dark green
Cytoplasm light green
Sites of enzyme activity red


Incubating Medium:

  • Combine 20 ml of buffer solution, 48 ml of distilled water and 4 ml of substrate solution.
  • Combine 3.2 ml of Pararosaniline solution with 3.2 ml of sodium nitrite solution. Mix for one minute.
  • Add the second solution to the first.
  • Adjust pH to 5.

Buffer Solution:

  • 5.9 g Anhydrous sodium acetate
  • 14.7 g Sodium barbiturate
  • 500 ml Distilled water (boiled)

Do not adjust the pH of the buffer and store at 4°C.

Substrate solution:

  • 40 mg Naphtol As-BI phosphatease, sodium salt
  • 4 ml N.N-dimethylformamide

Pararosaniline Solution:

  • 2 g Pararosaniline (C.I.#42500)
  • 50 ml 2N HCl

Use heat to dissolve, filter when cool and store at 4°C

Sodium Nitrite Solution:

  • Sodium Nitrite - 1 gm
  • Distilled Water - 25 ml
Prepare fresh and store at 4°C.
Methyl Green
  • Methyl Green (C.I.# 42585) - 1 g
  • Phosphate/citrate buffer 0.1M pH 4.0 - 100 ml


Gerrits, P. O. and Smid, L., "Staining Procedures for Tissues Embedded in 2-Hydroxyethyl Methacrylate", Heraeus Kulzer.

Product Information

Technovit Glycol Methacrylate embedding kits H7100 / H8100