sludge

And data analysed by the BBC and shared with the UK's Department for Transport casts further doubt on one of the key ingredients in HVO, a material called palm sludge waste.

They gave that reactionary sludge a fresh coat of populist paint and found that it resonated with a large chunk of the American public.

The remains of burned homes and vehicles along the scenic coastal stretch were caked in a layer of sludge.

Back at the plant I'm looking at an unappetising green sludge.

Do not use a garden hose to soak the ash because you’ll just create a toxic sludge.