It is not at all recommended to print checks on white paper. It will give you very much hard time at the bank even though checks are processed by OCR nowadays after the check 21 law. Use Any Blank check paper stock,
Blank check stock has security features which help prevent fraud.
You can purchase the blank check stock from any local office stores or Online, Amazon etc

You can use any kind of printer you have already at home or office.

Most of the banks today have updated scanning technology and do not require the MICR after Check21 Act. Checks are allowed to process through image OCR for faster processing. Like you deposit the check by phone and At ATM machines. That is the reason these days you don't get original checks any longer but a yellow replacement copy of checks which is in the same class as a legal copy of checks.
Mobile banking works today
Once the check has been converted to an image, the presence of MICR ink on the original item may not be known downstream
MICR stands for Magnetic Ink Character Recognition; unlike regular laser toner, MICR toner contains iron oxide.
The use of MICR Toner may incredibly speed up the handling of your printed checks.
The majority of the printer you have at home or office may have MICR Toner easily available in the market (just Toner-You don't need to change the whole printer). Search your printer model online for MICR toner. It is much the same as a normal toner, however, Iron Oxide blended in the toner. After printing, nobody comes to know any deference yet readable by a MICR reader.
The cost for MICR Toner cartridges will vary upon the model of the printer but will print a considerable number of checks because of the low utilization of toner per page of checks. For instance, the MICR Toner for an HP LaserJet 1100 sells for $40.00 to $50.00 with a normal page yield of roughly 2800 pages - that is around 8400 checks if it is a 3 Per page Checks.

It is a letter size paper used for printing checks and check draft. You can purchase blank check paper from any local office supply store like Office Depot, OfficeMax, staple or online store like Amazon, walmart.com and many many authorized sellers. Always buy good quality blank check paper. It has several security features.

Most of the banks today have updated scanning technology and do not require the MICR after Check21 Act. Checks are allowed to process through image OCR for faster processing. Like you deposit the check by phone and At ATM machines. That is the reason these days you don't get original checks any longer but a yellow replacement copy of checks which is in the same class as a legal copy of checks.

Mobile banking works today

Once the check has been converted to an image, the presence of MICR ink on the original item may not be known downstream

MICR stands for Magnetic Ink Character Recognition; unlike regular laser toner, MICR toner contains iron oxide.

The use of MICR Toner may incredibly speed up the handling of your printed checks.

The majority of the printer you have at home or office may have MICR Toner easily available in the market (just Toner-You don't need to change the whole printer). Search your printer model online for MICR toner. It is much the same as a normal toner, however, Iron Oxide blended in the toner. After printing, nobody comes to know any deference yet readable by a MICR reader.

The cost for MICR Toner cartridges will vary upon the model of the printer but will print a considerable number of checks because of the low utilization of toner per page of checks. For instance, the MICR Toner for an HP LaserJet 1100 sells for $40.00 to $50.00 with a normal page yield of roughly 2800 pages - that is around 8400 checks if it is a 3 Per page Checks.

Many US bank is using Optical check reader (OCR) today which can scan the checks printed on blank stock with regular office/home laser printers. After Check 21 Law (The Check Clearing for the 21st Century Act (Check 21) Checks are allowed to replace by image (Substitute Checks) for faster Processing through images. By creating a digital check image, it is able to fast-track processing using the “Check 21” system already in use by most banks.    Most of the banks today have updated scanning technology and do not require the MICR after Check21 Act. There are Many Banks and check cashing places still keep MICR Reader, Have not replaced yet to OCR Reader. Be that as it may, Atm Deposits and Mobile Deposits and all officially through OCR perusing and VIA Image process

MICR stands for Magnetic Ink Character Recognition; unlike regular laser toner, MICR toner contains iron oxide.

The use of MICR Toner may incredibly speed up the handling of your printed checks. The majority of the printer you have at home or office may have MICR Toner easily available in the market (just Toner-You don't need to change the whole printer). Search your printer model online for MICR toner. It is much the same as a normal toner, however, Iron Oxide blended in the toner. After printing, nobody comes to know any deference yet readable by a MICR reader.

Bank identification number often called Bank fraction number. After check 21 law Bank fraction number is not much used anymore. It is not mandatory to have it on the check or a check draft to process the check.

                The prefix (no longer used in check processing, yet still printed on most checks) is a 1 or 2 digit code (P or PP)                 indicating the region where the bank is located. ... For example, a check from Wachovia Bank in Yardley, PA, has                 a fraction of 55-2/212 and a routing number of 021200025.

                A fractional is used to determine the financial institution of the share draft if the MICR line is ever damaged or torn off:

                The fractional number goes like this: XX-YYYY/ZZZZ.

                ZZZZ is the first 4 digits of your routing number (you can skip the leading zeroes).

                YYYY is the next 4 digits of your routing number (the last, 9th digit, is control digit).

                XX is the city/state where the bank is located (I believe its based on the original HQ, I know that for WF in                 California its 11, which is San Francisco). You can find the full list on Wikipedia, once the blackout is over (in the                 mean time - call your Congressman and voice your objections to SOPA).