Lead is also used in ceramic glazes and as a stabilizer in plastics. Lead was used extensively as a corrosion inhibitor and pigment in paints but concerns over its toxicity led to the CPSC in 1977 to ban the use of lead in paint for residential and public buildings.
The first digit assigned to all Visa cards is four, and the second through sixth numbers are connected to the financial institution. Then, either the seventh through 12th numbers, or the seventh through 15th, are the account number, while that final 13th or 16th digit is the check number.
Visa number: the visa number is the eight digit number in red located in the lower right-hand corner. If the visa was issued prior to 2002, the visa will look slightly different than the picture above but the number is located in the same place. For visas issued before 2000, the number is located at the top of the visa in the center. Like the other two it is also red in color.