Is a test to determinate quickly and easy the good transfor for the FFA to Biodiesel
a). 1 cup put 27 ml of methanol.
b). Add exacly 3 ml of Biodiesel( your final product)
Its important to be 'dry', free of water to have a better test result.
c) Mix for a few minutes. After 30 min. see the bottom, if a little material is settle, there are some oil still in biodiesel.
If after 30min there are no settle material, you made a higly conversion fuel.
TWO LINKS
EXplain the test in Biodiesel comunity http://www.biodieselcommunity.org/methanoltest/
VIDEO of 3-27 test : http://www.youtube.com/watch?v=R3jGvefA4OI
may this help!