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.
A card number on VISA debit card is embossed 16 digit number, which starts with number 4 ( code of VISA). Each number or set of numbers are codes as first number signifies the system being used ( for example: 4-VISA, 5-Master, 6- Discover) other defines Bank number, Account number & check digits.