If in doubt, some tiny piece of black artist's tape over questionable area does wonders...
Another modern annoyance is smartphone, iPods, etc even if off... Had a dark charging iPod off while loading film, but when charged, it lit up to remind me it charged... Fone calls while dark can be an issue...
But really, smart handling of materials while loading does help... Not leaving film or paper potentially exposed to light, dust, moisture etc when handling will help by always leaving covered in black bags, boxes, holders and keep the process moving... Limiting potential exposure to these elements is your best bet...
Steve K
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