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 a major credit card issuer uses the digits 2 through 6 to identify the bank. 7 to 12 or 15 are used to identify the account number and the last number is called the check digit. The pattern in Visa credit cards can vary greatly because all of Visa credit cards do not have the same amount of digits on credit cards.