配方类型:

INTRODUCTION

配方说明:

配方组成:

potassium alum powder/1/2
stir until dissolved and then add the following chemicals in the order
given, stirring each until dissolves
distilled water/8
b) warm dissilled water/2 1/2
a) sodium hyposulfite/32
pure sodium sulfite/1/2
pure acetic acid (28%)/1 1/2

配制方法:

add (b) to (a) and store in dark bottles away from light.