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pathologicalreid · 2 months ago

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litmus test | s.r.

in which Spencer needs your expertise to help solve a murder, but crime fighting is most decidedly not for you

find more chemist!reader here!

who? spencer reid x chemist!reader category: flangst (like. the end is a little angsty and it has case details) content warnings: typical cm violence, science talk, fem!reader, reader is not built for crime, morgan being an older brother, some fun banter!! death by firework is crazy lmao word count: 1.68k a/n: this is one of my favorite fluff pieces i've written in agessss i missed chemist!reader so much i learn so many things when i'm writing her. this was a request! i hope you like it as much as i do!!

“Do you have a second?” Spencer asks, his voice slightly choppy over the phone. Between his ancient phone and being inside concrete police precincts, some disconnect was bound to happen.

Saving your document to your computer, you rest the lab phone between your shoulder and ear, “If you’re asking me if I have any corrosive chemicals in my hands, the answer is no.”

He chuckles lightly, “I never know with you.”

You roll your eyes in response, even if he can’t see you, “It was one time and I needed a new phone case anyway.”

“You fused the plastic of your phone case to the material of your phone,” he retorts far too quickly for your liking.

“Yes,” you acquiesce, “but I know the exact chemical reaction that caused that phenomenon.” You cross your legs one over the other, maintaining your balance on your lab stool as you speak to Spencer over the phone.

He gave a light hum in response, “Speaking of chemical reactions – I need your help.”

Your eyebrows shot up in surprise, “You’re asking me for help in chemistry?” There really was a first time for everything, you suppose.

Spencer was more than capable of navigating a lab on his own, even so, he admits, “You have more applied practice than I do.”

Pursing your lips, you nod to yourself, “Fair enough. What’s stumping you, Dr. Reid?” Your inquiry, while innocent enough, garners a wolf whistle from your graduate assistant.

“There’s something burning a hole in these bones, and I’m not sure what would be causing it to happen this fast,” he explains, giving you minor background information on how long the bones were out and if the medical examiner had treated them with something.

You clear your throat, frowning at the notes you had scrawled down in front of you, “Burning or corroding?” What was seemingly a meaningless distinction would actually allow you to filter through approximately half of the possibilities.

“Corroding,” he corrects himself, “My mistake.”

Crossing off some of your notes, you purse your lips at the new possibilities, “No worries. Did you try flushing it out with water?”

You hear papers flipping on his end of the call before you get a response, “That would destroy evidence.”

“Well,” you raise your eyebrows, “It sounds like your evidence is destroying itself.”

“Baby,” Spencer says in a no-nonsense tone reserved for when he was deep in a case. You could’ve sworn you heard Morgan in the background of the call mocking him for the pet name.

Turning back to your notes, you sigh, “Yeah, yeah, all work and no play. Was the body buried?”

“Partially,” his reply intrigues you, “I can have Garcia send you the crime scene photos if you think it’ll help.”

Wrinkling your nose at the thought, you made an unsure sound, “Right, because nothing says lunchtime like getting up close and personal with a homicide victim.”

“What lunchtime? It’s three pm in D.C. right now,” he caught you, a slight chiding tone in his words.

Ignoring his questions, you ask more of your own, “Was the body near water? Did they test the pH of the soil and water?”

There were more papers flipping, likely someone presenting the results of those tests to him, “Yeah, the soil was a five-point two and the water was a seven-point eight,” he listed off for you.

While your knowledge of the pH of the soil in Iowa was limited, you did know that those levels were pretty on par for the northern Mississippi River. “O-kay,” you say, extending your vowels, “and they didn’t find anything else on the scene that points to corrosive materials. Hydrofluoric acid?” You posit, “No, you know what – maybe you should send me those files. My work email is encrypted, you can give it to Penelope.”

He speaks to someone else in the room with him and you resist the urge to ask him if he’s enjoying Iowa, “It’s sent,” he confirms with you.

Pulling up your email only takes a moment, and once you get over the initial shock of seeing a dead body on your computer screen, you lift your lab glasses to the top of your head in order to get a better look. “I mean,” you think for a moment, “those look like alkali burns to me. I’ve never seen them on bones before, but you should do a litmus test to check either way.”

“So, we rinse it with water?” He asks, seeking instruction from you in a way that makes you feel oddly powerful.

Your eyes widen, “No, no, no. If it’s a metal compound then it’ll be covered in a mineral oil, so rinsing it with water would actually make the burn worse.”

Pausing for a moment, you consider the possibility that Spencer didn’t have the luxury of time – he was trying to solve a murder, not do experiments in a lab.

“Alkali burns can be serious, it all depends on what caused them, and most are helped by rinsing with water. So, unless you have the time to test for metal compounds, I’d go ahead and rinse it. You might want to brush the damage to the bones with a dry brush first. If there’s lime on the bones it’ll foam, which not only will corrode the bones even further but it might release a toxic gas,” you have no idea how the corrosion would interact with bone marrow, but something tell you that you don’t want to know

“Wait a minute,” Derek interjects, being included in the conversation now that Spencer put the call on speaker, “I thought things like alkaline water were good for you.”

You scoff instinctively, “Oh, there’s no definitive evidence that shows alkaline water as having any real health benefits. Especially not the benefits that the internet says it has.” Straightening up in your stool, you continue, “In fact, there is evidence from the NIH that says drinking alkaline water could cause kidney damage. There’s a particular-“

“My bad,” he interjects, effectively stopping your rambling before it really took off, “I forgot whose girlfriend I was talking to.”

Groaning at your new vexation, you huff, “Oh, fuck off, Derek. Go kick down a door.”

Spencer quickly switches the phone back, “Thank you, angel.”

Squinting at the photos that were still on your laptop screen, a crude, disturbing thought came to mind, “You know, sparklers can cause alkali burns. It might be something to consider because of the diameter of the burns.”

Your boyfriend was silent on his end of the call for so long that you had to check and make sure the call hadn't dropped. “Did you say sparklers?”

“Yep,” you confirm, “like the ones you can get everywhere this time of year.”

He says something to Morgan, placing his hand over the receiver so you can’t hear, “There’s only one spot in this town, though. I’ve gotta go, see you soon.”

“Stay safe, please! I prefer your bones unburned,” you rattle off into the phone before it clicks, placing the phone back on the stand and deleting the crime scene photos from your inbox.

The front door to the apartment opens and shuts quietly, with Spencer under the assumption that you already went to bed, he was surprised to find you on the couch, nursing a cup of tea. “Hey, baby,” he chirps, unusually peppy for this time of night.

“Hey,” you say half-heartedly, threading your fingers through the handle of the mug.

Your somber tone gets Spencer’s attention, “What’s wrong?”

The slight panic in his voice causes your eyes to snap up to his, “Nothing,” you murmur. “It’s just… the woman who was in those pictures. There- the burns on her bones, they were signs of torture, weren’t they?”

You’d been thinking about the burns ever since Spencer showed them to you, “Yes,” he answers with a reciprocating softness, sitting down next to you on the couch. “The medical examiner concluded that she was burned antemortem.”

That woman had been burned alive by fireworks, sparklers had seared their way through skin and muscle until it finally met her bones. You blink a few tears from your eyes at the thought, “I like my lab, Spence.”

The confusion on his face was palpable, “I know you do.”

“I like my minimal human interaction and my chemicals, and I like knowing why certain things cause certain reactions. I like it when things make sense.” You take a deep, shaky breath, “Killing someone. Torturing someone with fireworks. That just doesn’t make sense to me.”

You had no interest in hearing the excuses that the killer had provided. You had no interest in hearing the psychological breakdown of that woman’s killer. Spencer knows that, “The photos got to you?”

Taking a sip from your mug, you nod solemnly, “I can’t stop thinking about the way it must have felt. Oh, the smell must have been horrible. That poor woman.” In theory, it was a ridiculous notion, killing someone with fireworks seemed neither probable nor possible. Yet here you are.

“But we got the person who killed her,” Spencer reassures you, resting his hand gently on your knee. “We couldn’t have done it without you,” he adds.

Your face warms at his compliment, “I wish I could have helped before she was killed.” You were grateful that Spencer hadn’t passed on any personal information about the woman, it was easier for you if you kept things in separate storage files in your mind.

Spencer hums, reaching out and sweeping a strand of hair behind your ear, “There’s always going to be another one. I’m sorry about the photos, I should’ve made sure Garcia only sent the necessary ones.”

Nodding absentmindedly, you look at him thoughtfully, “This will pass, but for tonight I just feel bad for the victim.”

“I can have Penelope share some of her favorite baby animal videos, if you’d like,” he offers softly, resting his head on your shoulder.

In return, you give him a small smile, “Well, I suppose it really can’t hurt.”

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