SPI-Chem Karnovsky's Fixative - Formaldehyde-Glutaraldehyde Solution
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This is a very specific solution of formaldehyde and glutaraldehyde in a sodium phosphate buffer.
Ready to mix-and-use kit contains:
16% Formaldehyde 2x10ml ampoules
50% Glutaraldehyde 1x10ml ampoules
Sodium Phosphate Buffer, 0.2M 1x50ml vial
It is reported that the mixed fixative may be stored at or below 4°C for up to six months prior to use without compromising retention of ultrastructural detail.