Well first of all you cant use the flame test for lead because it forms a toxic lead vapour which is harmful for humans ---brain damage, neurological interference etc.
generally you add Hydrochloric acid to a solution of cations. If a white precipitate forms (this is lead chloride), then lead ions are present. Judging by your question, i think you mean an additional test. To verify the lead ions, you cann add pottassium iodide and the lead ions will react with the iodide ion forming lead iodide which is a yellow precipitate
