Carbon-14 analysis testing is the method that manufacturers and other industry stakeholders uses in determining the biobased (biomass-derived) content of a product. Biomass usually contains a specific amount of the radioactive isotope carbon-14 while petroleum-based ingredients do not contain any carbon-14, hence the percentage of carbon in a material derived from recently living resources, such as plants, can be calculated. According to ASTM D6866 standards, carbon-14 testing, which is applicable to liquids, solids, and gases, can determine the amount of biomass-based material used in the formulation of a product compared to petrochemical-derived alternatives.