When you shop with Carolina, you're not alone! All of our products are backed by unparalleled technical support, available from 8:00am to 6:00pm, ET, Monday through Friday. Live chat is available from 8am to 5:30pm ET, Monday-Friday. Contact information (Live Chat, email, and phone) is provided after placing your order at Amazon. From our beginnings in 1927, Carolina Biological Supply Company has grown to become a leading supplier of science teaching materials for all levels of education. Today, from our headquarters in Burlington, North Carolina, we serve customers worldwide, including teachers, professors, homeschool educators, hobbyists, and professionals in health and science-related fields. Product Details Laboratory Grade. View multiple slides with one application; high viscosity; 1,250 centistokes. Clear, non-gumming; refractive index 1.515; in 15-mL dropping bottle; no PCBs. Storage Code: Green general chemical storage This product is specially made for use in science education laboratories; no certificate of analysis is available.