Reference
https://books.google.com.my/books?id=dV31AJxVVYIC&pg=PA319&lpg=PA319&dq=Ceramic+characteristic+acidic+or+alkaline&source=bl&ots=r1P9pWQ9Pj&sig=4gOHtAtXStpxpUAKznZwThaEDds&hl=en&sa=X&ei=dvXxVPrmLcytuQTfn4C4Cg&ved=0CCgQ6AEwAg#v=onepage&q=Ceramic%20characteristic%20acidic%20or%20alkaline&f=false
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