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Cross-Link Porphyrin Films. (a) measure the exact amount of H2SO4 solution used. (b) save 2-5 mls of H2SO4 stock solution in vial (C) save 2-5 ml of H2SO4 used to cross-link the solution (if colored). (d) measure the exact amount of HCl solution used. (e) save anbout 2-5 mls after reaction (in case if the solution is colored). (f) 2% HCl solution in a 100 ml beaker- that implies 2 ml HCl and 98 ml of millpore water.
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