Kohler kitchen sinks come in a variety of styles, designs and materials. see your function and installation options and find the perfect sink for your ktichen. Hunan noli enamel co., ltd is the leader manufacturer of enamel frits & inorganic pigment in china. now we have 30,000 m/t enamel frits and 2,000 m/t inorganic pigments annual capacity, and 10,000 m/t rtu(ready to use) powder and electro static powder. 1 milling additon ratio for cast-iron black enamel: frit 100 clay 5-7 quartz powder 0-5 borax 0.5-0.8 sodium nitrite 0.2 black pigment 2-5 water 50-55 ml note: adding 10-20% quartz powder in acid resistant black enamel frit slurry fineness 0.5-1.0g/150mesh. 100 ml specific gravity 160-170g/100ml 2 cast iron opaque enamel(sub-opaque enamel ) frit 100 clay 5-6 borax 0.5-0.8 Since they were founded in 1896, lodge has been one of the oldest cookware manufacturers in america. lodge manufactures a variety of cast iron cookware and bakeware, including the popular skillets and dutch ovens. all of lodge's cast iron cookware comes pre-seasoned to eliminate the down time after initial purchase.