The complete pesticide formula shall include a listing of each active and inert ingredient and the percentage of each ingredient. This information will be kept confidential and is exempt from disclosure as a public record as provided by RCW 15.58.065 except for names of inert ingredients of pesticides exempt under section 25b of FIFRA which according to C.F.R. 152.25 (g)(3)(i) must have this information on the label. Information required by this section may be submitted on company letterhead marked "confidential" in red ink on each sheet or each "EPA confidential statement of formula" information sheet.