Synthetic ultramarine , being very cheap , is largely used for wall painting , the printing of paper hangings and calico , etc. , and also as a corrective for the yellowish tinge often present in things meant to be white , such as linen , paper , etc. .
Synthetic ultramarine are very cheap , and is largely used for wall painting , the printing of paperhangings and calico . It is also used to correct the yellowish tinge found in things meant to be white , such as linen , paper , etc. .