Recipe for 2% Paraformaldehyde

To make 100ml of 2% Paraformaldehyde

1. Add 2 grams of paraformaldehyde to 48 ml of water
2. Heat to dissolve
3. Add NaOH dropwise until solution clears (10-20 drops of 2M)
4. Add 50ml of 2x PBS and mix
5. Remove from heat and place on ice
6. pH from 7.2 to 7.4