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mirandaisaacs mirandaisaacs
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6 years ago
A step-wedge is a device of layered metal steps of varying thickness used to
 
  A) determine film freshness.
  B) determine safety of the safelight.
  C) evaluate tube head stability.
  D) test the strength of processing chemicals.
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sophiakhalid12sophiakhalid12
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mirandaisaacs Author
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6 years ago
Thanks
smdavis
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Yesterday
Brilliant ツ
Tim0301
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2 hours ago
Thank you, thank you, thank you!
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