Reliable and thorough testing and formulation that fulfills the needs of various specialty applications. These marking pens contain high-purity inks for safely marking nuclear pipes, vessels, stainless steel, and titanium. Welding operations, automotive plants, and aircraft industries can also benefit from them. The ink/ paint has been certified by an outside laboratory and will not contaminate or adversely affect the surfaces being marked. *More colors available by special request* Included in your purchase: These markers include certification paper-work, lab-report paper-work, local-law compliant labeling for shipment and storage, SDS sheets corresponding to the particular batch, and letters of compliance with the specs requested. Each marker and carton is tagged with the batch #. The shelf life is noted in the lab report paperwork.