It is possible to exist more than 1 color code for same resistance-value. I doubt, is there any convention about use only one of them (while manufacture) .
Example : Say an 1 ohm resistor could be expressed as Black-Brown-Black (01*10^0) simply, but when i buy 1 ohm resistors, i always found Brown-Black-Golden (10*10 ^(-1)) being sold.
Now, i want to know, are the all possible codes correct? or there are some conventions about it?