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Li2CO3 A very strong flux, used to reduce viscosity, reducing maturing times and lowers firing temperatures without affecting the firing range. 1% can increase gloss to a marked degree, 3% can reduce melting temperatures by several cones. However, more than 5% can cause devitrification, shiver and pin holing. Increases colour response of copper and manganeses. Can create mottled effets due to flow. Glass jar is for illustration purposes only.