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So obviously I want fresh, I want moist, but not oily moist.

The synthetic opioid drug is wrapped in foil, sealed in plastic, then dropped with an oily splash into the petrol tank of the trafficker's nondescript car.

Ash tends to clog the soil, and oily substances can hamper the ground’s ability to absorb water.

It also closely resembles sebum, the oily substance that coats our skin and protects it from drying out.

"There are others we can use, but they tend to be more oily," Mrs Rabbett said.