**We Hit the Big 3-0! š The 30th Nedās Notes ā Can You Believe It?
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This week, my curiosity (and Bobās questionable faith in me) landed me squarely between two pieces of equipment. Both sound like they belong on a spaceship: the atmospheric chamber and the vacuum chamber. They both develop fingerprints. Intimidating? You bet. Neither one is immune. And each of them apparently have the power to ruin my day if I press the wrong button.
šŖ Atmospheric Chamber vs. Vacuum Chamber: A Tale of Two Fumes
So hereās what I learnedābecause Bob insists I āunderstand the science before I break anything.ā Bob. Crime Scene Tech. Find him in my books.
Atmospheric chambers develop fingerprints the old-fashioned way:
Normal air pressure.
Fumes circulating. What fumes you ask? Stay tuned for future Ned’s Notes.
Patience requiredālots of it.
Theyāre easier to use, cheaper to operate, and you can toss multiple items in at once. Bob says itās like āslow-cooking evidence.ā I say itās like waiting for my coffee to finish brewing while contemplating all my life choices.
Vacuum chambers, on the other hand, work under reduced air pressure.
This is where things get fancy.
Because of the lower pressure, the fingerprint residues react more evenly and way faster. Over development? Practically impossible. The humidity stays steady, the development stays clean, and the evidence stays happy. Itās like the spa treatment of fingerprint processing, except significantly less relaxing for me.
Bob claims even I couldnāt mess things up in a vacuum chamber. I didnāt appreciate his comment.
š§Ŗ What I Actually Did (and How Close I Came to Trouble)
Bob handed me something fragile and expensive and said, āHold this.ā I panicked and almost dropped it. He took it back.
Nuts.
But in the end I did get a great firsthand look at how these chambers work. Watching a print develop inside the vacuum chamber was like watching a Polaroid picture appear. If Polaroids came with warning signs and fire suppression systems.
And for the record, I have not touched any fingerprints before photographing them. So I donāt need to make a trip to Dunkin Donuts. Phew.
šµļø Until Next Weekā¦
At the end of the day, whether youāre using the atmospheric āslow cookerā or the vacuum āhigh-speed wonder,ā the goal is the same: get those beautiful ridge patterns to pop.
And me? Iām just hoping to get out of this lab without setting off the ventilation alarms again.
Stay curious, keep your prints where they belong, and keep yourself out of trouble!
āNed
P.S. as we all need a little help sometimes, my AI friend helped me edit this week. Itās holiday season dear readers ā excuses galore! šāØšāļø
š
š¼šššÆļø And even though I look smart, this topic is CrAAAzie hard! Donāt be discouraged all of you Luddites out there! It happens rarely.
šš§Ŗ Crime Scene Tech Tip:
Vacuum chambers are great for consistent, even development, especially on tricky surfaces. Atmospheric chambers are more affordable and perfect for processing multiple pieces of evidence at once. Use whichever gives you the best controlā¦ and keeps Ned farthest away from anything that requires a safety waiver.
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