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At this concentration the rosin soap rises to the surface and is skimmed off.
The collected soap is called raw rosin soap or rosinate.
The raw rosin soap is then allowed to settle or is centrifuged to release as much as possible of the entrained black liquor.
Rosin consists mainly of abietic acid, and combines with caustic alkalis to form salts (rosinates or pinates) that are known as rosin soaps.
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