How make the silica gel decolor the dark oil test

We make 2 different silica gel sizes for test as following video. Short video to show few steps need to do before decolor the oil, pls check carefully.

Points as following pay attention:

1. The silica gel height in the bottle can not less than 10cm.
2. Make sure both the bottle neck careved with the cloth, also put the cloth after silica gel in and before pour the oil

• 
  Tracer in paraffin removed
• 
  2 Containers finish loading
• 
  Bleaching chemical–silica gel loaded
• 
  NMP+SILICA GEL order finished