Keywords: Film of soap interference 4 green.jpg Film_of_soap_interference_4 jpg 2010-01-06 23 06 UTC Film_of_soap_interference_4 jpg User Patrick Nordmann derivative work Pieter Kuiper <span class signature-talk >talk</span> Selecting the green channel Pieter Kuiper Film_of_soap_interference_4 jpg Soap films Green light |