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.
I am an F1 student visa. I have Been in and out of US three times for vacation to my country. So that means I have 3 F1 visa on my passport. I applied for OPT and approved, the employer asked me for my current visa number. Is it the red 8 digits number on my visa? The first two visas, the 8 digits are all numbers. But my third visa, I don't know If its said  C203xxxx or  0203xxxx. Is it possible that the US consulate messed up the print?