Question

method used to separate oil from ink​

Answer 1

You can also apply Paper Chromatography and simple distillation process. Centrifugal separation is another process of separating two fluids with contrast in densities.

Answer 2

Dear

the following is  much more easy and cost lowering method of separation:

Using a separating funnel:

A separating funnel is used for the separation of components of a mixture between two immiscible liquid phases. One phase is the aqueous phase and the other phase is an organic solvent. This separation is based on the differences in the densities of the liquids. The liquid having more density forms the lower layer and the liquid having less density forms the upper layer.

Applications:  

To separate a mixture of oil and water.

To separate a mixture of kerosene oil and water.

You can also apply Paper Chromatography and simple distillation process.