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The Na OH treatment produces two fractions, base soluble and insoluble.
The former may be kept for dating purposes by being acidified, rinsed and dried in an oven.
A variety of solvents may be used in the extraction process, depending on the type of material and the contaminants present.
A soxhlet extractor is the most common apparatus used in the extraction method.
This apparatus continually recycles the solvents being used so that they do not have to be replaced.
The insoluble fraction usually contains the sample minus the contaminant and is the dateable component.
Sometimes, samples undergo a solvent extraction prior to ABA pretreatment to remove contaminants such as resins and waxes.