Cobalt Naphthenate (6%)/2.5 The mill base is ground with a three-roll mill to a fineness of 5 to 5.5 on the N.S. gauge. Let-Down Titanium Dioxide (enamel grade)/225 Calcium Naphthenate (4%)/5.5 "Exkin" #2/1.0 Soya Lecithin/5 "Cab-O-Sil" M-5/10 Mineral Spirits/25 Calcium Carbonate/442 Phthalic Alkyd Resin/125.0 "Duraplex" D65A/200 Mineral Spirits/175.0 Lead Naphthenate (24%)/5.0