Inkscape tutorial blending modes and layer panel
http://www.youtube.com/watch?v=HKITjvSndfk
http://www.youtube.com/watch?v=HKITjvSndfk
http://www.youtube.com/watch?v=jRVCLbsaAqg
http://www.youtube.com/watch?v=C3LpSeJnTNI
http://www.youtube.com/watch?v=T6IPJS6Ucpw
http://www.youtube.com/watch?v=Y6DmxjSOCsU
http://www.youtube.com/watch?v=0N0a94i4T7I
http://www.youtube.com/watch?v=yy_ocPwsVQM
http://www.youtube.com/watch?v=OSuLF4FfeGA
http://www.youtube.com/watch?v=w1Ryk6LQ3EI
http://www.youtube.com/watch?v=0icrVqiX7B0
http://www.youtube.com/watch?v=Uo2jvUI457g
http://www.youtube.com/watch?v=L8ql9owBqA0