Situation: polarizable clear microcrystal
Staining panel:
(1) Movat pentachrome stain
(2) Sirius Red stan for amyloid
(3) von Kossa
(4) alizarin red at pH4,1 to 4.3
(5) oil red O (after 72 hour incubation)
|
Material
|
Movat
|
Sirius Red
|
von Kossa
|
alizarin red
|
oil red O
|
|
cellulose
|
yellow
|
red
|
negative
|
negative
|
negative
|
|
calcium oxalate
|
sea green
|
negative
|
black
|
negative
|
negative
|
|
other calcium crystals
|
|
negative
|
|
positive
|
negative
|
|
talc
|
light green-blue
|
negative
|
negative
|
negative
|
light pink
|
Additional stains:
(1) GMS: stains cellulose black but not talc
(2) PAS: stains cellulose
(3) Congo red: stains cellulose
Some of these crystals (cellulose, talc) can be seen within small blood vessels of people who inject drugs intravenously.
If the identification is still in doube, then infrared spectroscopy should be performed.
