please explain printing method im talking about

i forget what its called...but its when you use a low contrast filter on an englarger and do a test strip and time it and then use a high contrast test strip and time it and then expose the paper with both. does anyone know what im talking about? and if you do could you please explain it in greater detail?

thanks

 

did i make this up? or is what im talking about real?

 

split filtering. check your email.

**edit** the forum won't reveal your email addy and it won't let me attach files. give me your addy.

 

s_grams@hotmail.com

 

sent.