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Lemongrass oil, cedarwood oil, citronella oil and peppermint oil are among the common ingredients.

Colombian dealers routinely rub the fissures with cedarwood oil to improve clarity, but that traditional technique has evolved over the years to include high-tech resins and epoxy fillers.

Some feel that cedarwood oil is the only material that should be used because it can be removed easily and re-treated.

Place a drop of cedarwood oil on the centre of the cover-slip.

Cedarwood oil, distilled from the wood of Juniperus virginiana.