led ▁coverage , ▁sang ▁de ▁bo e uf ▁was ▁produced ▁with ▁a ▁variety ▁of ▁sh ades ▁of ▁colour ▁and ▁as ▁well ▁as ▁m ott ling , ▁stre aked ▁effects ▁in ▁the ▁gla ze , ▁which ▁often ▁f ades ▁to ▁white ▁at ▁the ▁top ▁of ▁pieces , ▁and ▁convers ely ▁thick ens ▁around ▁the ▁shoulders ▁of ▁v ases ▁and ▁at ▁the ▁foot , ▁which ▁is ▁often ▁not ▁fully ▁covered ▁by ▁the ▁gla ze . ▁There ▁is ▁often ▁crack le , ▁and ▁a ▁green ish ▁t inge ▁at ▁the ▁edges ▁of ▁the ▁gla zed ▁area , ▁where ▁the ▁gla ze ▁is ▁thin . ▁All ▁of ▁these ▁were ▁considered ▁des irable ▁effects . ▁Gener ally ▁the ▁gla ze ▁is ▁only ▁applied ▁to ▁the ▁outside ▁of ▁closed ▁shapes , ▁the ▁inside ▁and ▁rim ▁left ▁with ▁a ▁clear ▁gla ze . ▁The ▁red ▁gla ze ▁was ▁probably ▁applied ▁by ▁sp ray ing . ▁Other ▁colours ▁that ▁may ▁appear ▁are ▁tur qu o ise , ▁lav ender , ▁and ▁pur ple . ▁ ▁The ▁great ▁number ▁of ▁very ▁sensitive ▁variables ▁meant ▁that ▁the ▁gla ze ▁colour ▁and ▁effects ▁were ▁initially ▁not ▁reli ably ▁controlled ▁by ▁the ▁mak ers , ▁leaving ▁an ▁element ▁of ▁random ness ▁that ▁appe aled ▁to ▁Chinese ▁a est het ics . ▁By ▁the ▁late ▁ 1 8 th ▁century ▁more ▁control ▁was ▁possible . ▁ ▁Western ▁versions ▁ ▁In ▁the ▁ 1 9 th ▁century ▁various ▁Western ▁pot ters , ▁especially ▁in ▁the ▁emer ging ▁art ▁pot tery ▁movement , ▁tried ▁to ▁copy ▁the ▁Chinese