are seen with acrylic resin systems both self crosslinking and non self crosslinking contrast ratio increases are observed for all types of resin systems similarly various pigmentary tio 2 particles respond differently to the addition of nano zno particles thus various pigmentary tio 2 particles can be used in accordance with the principles of the present invention commercial sample 1 a tio 2 product sold under the trade name kronos 4311 by kronos worldwide inc located at 16825 northcase drive suite 1200 houston tex 77210 4272 responds well in terms of tint strength and contrast ratio and is a preferred component commercial sample 3 sold under the trade name tiona rcs 2 by millennium chemicals inc located at 20 wright avenue suite 100 hunt valley md 21030 performs similarly but it is not as efficient commercial sample 2 sold under the trade name tiona 596s also by millennium chemicals inc located at 20 wright avenue suite 100 hunt valley md 21030 has only minimal improvements when compared to commercial sample 1 and commercial sample 3 various dispersants may be used as known in the art additional tio 2 particle content in systems in accordance with the principles of the present invention increases the tint strength up to 40 however this improvement is not significant over paints without additional tio 2 particles hide is significantly improved with increasing tio 2 particle content thus in one embodiment of the present invention additional.