“Strong sensitizer” means a substance that will cause on normal living tissue through an allergic or photodynamic process a hypersensitivity that becomes evident on reapplication of the same substance and that is designated by the department. Before designating any substance as a strong sensitizer, the department, upon consideration of the frequency of occurrence and severity of the reaction, shall find that the substance has a significant potential for causing hypersensitivity.
Source:
Section 108175, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=108175..