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.
For example, even though American Express, Diner's Club and Carte Blanche all start with the number 3, you can confirm American Express numbers if the first digit, 3, is followed by a 4 or a 7. However, if a zero, 6 or 8 follow the 3, the credit card number belongs to a Diner's Club or Carte Blanche account.or example, Visa account numbers are either 13 or 15 digits long. If you see a credit card number that starts with a 4 and contains 13 or 15 digits, you can assume it's a Visa.