▁blood ▁lead ▁level ▁upon ▁k ohl ▁( sur ma ) ▁application . ▁ ▁A ▁group ▁of ▁research ers ▁in ▁China ▁tried ▁to ▁find ▁some ▁scientific ▁basis ▁of ▁this ▁claimed ▁property ▁of ▁lead ▁sul ph ide ▁ ▁( gal ena ) ▁rel ating ▁to ▁absor ption ▁of ▁sun ▁ray s ▁when ▁applied ▁into ▁the ▁eyes ▁in ▁the ▁form ▁of ▁k ohl . ▁The ▁authors ▁reported ▁the ▁ult rav io let ▁( U V ) ▁absor ption ▁spect ra ▁of ▁a ▁thin ▁film ▁of ▁lead ▁sul ph ide ▁prepared ▁on ▁" Ind ium ▁T in ▁Ox ide " ▁( IT O ) ▁substr ate . ▁ ▁The ▁spect ra ▁showed ▁that ▁lead ▁sul ph ide ▁thin ▁films ▁had ▁higher ▁absor ption ▁and ▁lower ▁trans mitt ance ▁in ▁U V ▁light ▁band ▁which ▁further ▁increases ▁with ▁the ▁increased ▁de position ▁voltage . ▁ ▁The ▁drive ▁to ▁eliminate ▁lead ▁from ▁k ohl ▁was ▁spark ed ▁by ▁studies ▁in ▁the ▁early ▁ 1 9 9 0 s ▁of ▁prepar ations ▁of ▁k ohl ▁that ▁found ▁high ▁levels ▁of ▁cont amin ants , ▁including ▁lead . ▁Le ad ▁levels ▁in ▁commercial ▁k ohl ▁prepar ations ▁were ▁as ▁high ▁as ▁ 8 4 %. ▁K ohl ▁samples ▁from ▁O man ▁and ▁C airo , ▁analyz ed ▁using ▁X - ray ▁pow der ▁diff raction ▁and ▁sc anning ▁electron ▁micro sc opy , ▁found ▁gal ena . ▁One ▁de cade ▁later , ▁a ▁study ▁of ▁k ohl ▁manufact ured ▁in ▁Egypt ▁and ▁India ▁found ▁that ▁a ▁third ▁of ▁the ▁samples ▁studied