Up to 10% will produce a creamy white finish with a matt or semi-matt surface. 0.1% titanium dioxide added to an iron glaze can help it to stabilise in the yellow/orange spectrum. High fired matt iron oxide and titanium glaze s can produce red colours. Below 1% it can increase durability; above 2% it creates minute crystals softening colours - increase in level will create variegation in the surface eventually creating matt surfaces. Glass jar is for illustration purposes only.