council direct decemb approxim law member state relat crystal glass eec council european commun regard treati establish european econom commun articl thereof regard propos commiss regard opinion european parliament regard opinion econom social committe regard special descript crystal glass product consequ oblig composit product differ rule member state differ hinder trade product lead distort competit commun obstacl establish proper function common market elimin adopt requir member state regard descript laid categori crystal glass characterist categori purpos commun provis adopt protect buyer fraud manufactur compli provis implement system commun rule requir establish standard method determin chemic physic properti crystal glass product bear descript laid direct adopt direct articl direct appli product fall head common custom tariff articl member state step ensur composit characterist manufactur label product refer articl form public product conform definit rule laid direct annex thereto articl member state step prevent descript column annex commerci product characterist column annex articl product cover direct bear descript list column annex bear identifi symbol shown column annex trade mark undertak inscript main part adject root descript appear column annex descript liabl confus therewith member state step ensur trade mark inscript immedi preced promin letter descript product product characterist column annex statement exact natur product product characterist column annex oj articl descript identifi symbol annex label articl method laid annex ii method verifi product bear descript identifi symbol characterist thereto column annex articl product intend export commun subject provis direct articl member state put forc measur need order compli direct eighteen month notif forthwith inform commiss thereof direct notifi member state ensur inform commiss time submit observ subsequ draft main law regul administr provis propos adopt field cover direct articl direct address member state brussel decemb council presid de koster annex list crystal glass categori gt pic file quot quot gt annex ii method determin chemic physic properti categori crystal glass chemic analys bao pbo determin combin bao pbo weigh gramm approxim gramm powder glass place platinum dish moisten water add millilitr solut sulphur acid millilitr hydrofluor acid heat sand bath white fume cool treat millilitr hydrofluor acid heat reappear white fume cool rins side dish water heat reappear white fume cool carefulli add millilitr water transfer millilitr beaker rins dish time sulphur solut dilut millilitr solut boil minut leav stand overnight pass filter crucibl poros wash solut sulphur acid time ethyl alcohol dry hour oven ºc weigh baso pbso determin bao weigh gramm gramm powder glass place platinum dish moisten water add millilitr hydrofluor acid millilitr perchlor acid heat sand bath white fume cool add millilitr hydrofluor acid heat reappear white fume cool rins side dish distil water heat evapor dry start millilitr solut hydrochlor acid heat gentli aid dissolut transfer millilitr beaker dilut millilitr water bring boil pass current hydrogen sulphid hot solut precipit lead sulphid drop bottom beaker turn hydrogen sulphid pass fine filter paper wash cold water satur hydrogen sulphid boil filtrat reduc evapor millilitr add boil mixtur millilitr solut sulphur acid remov heat leav stand hour pass fine filter paper wash cold water calcin precipit ºc weigh baso determin zno evapor filtrat separ baso reduc volum millilitr neutralis ammonia presenc methyl red add millilitr sulphur acid adjust ph ph meter ad sulphur acid caustic soda whichev case precipit zinc sulphid cold pass current hydrogen sulphid precipit settl hour collect fine filter paper wash cold water satur hydrogen sulphid dissolv precipit filter pour millilitr hot solut hydrochlor acid wash filter boil water volum millilitr obtain neutralis ammonia presenc litmu paper add gramm solid urotropin buffer solut ph add drop freshli prepar aqueou solut xylenol orang titrat solut complexon iii pink citron yellow determin precipit weigh potassium tetraphenylbor procedur gramm glass attack crush siev millilitr concentr hno millilitr hco millilitr hf platinum dish water bath sand bath dens fume perchlor acid continu dry dissolv millilitr hot water millilitr concentr hcl transfer millilitr graduat flask adjust volum distil water reagent solut sodium tetraphenylbor dissolv gramm reagent millilitr distil water remov light cloudi remain ad gramm hydrat aluminia shake minut filter take care filter millilitr obtain wash solut precipit prepar potassium salt precipit solut gramm kcl millilitr hcl solut tetraphenylbor pour stir precipit ceas filter sinter wash distil water dry desicc room temperatur pour milligramm salt millilitr distil water stir time time thirti minut add gramm hydrat alumina stir minut filter method oper aliquot acid digest milligramm dilut millilitr slowli add reagent solut millilitr assum milligramm gentli stir stand maximum fifteen minut filter tare sinter crucibl poros wash wash solut dry thirti minut ºc convers factor toler absolut determin analysi lower toler limit fix averag analys averag greater equal glass accept categori physic determin densiti method hydrostat balanc sampl gramm weigh air weigh immers distil water ºc refract index index measur refractomet microhard vicker hard measur standard astm revis load gramm take averag determin