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CrocodileChemist @crocodilechemi1.bsky.social · 30/08/2025

Blackberries! Loads of them! Going back tomorrow for more. Will make a crumble and jam. Have a plan for some colorimetry too😀#GardenIndicators

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Reposted by CrocodileChemist

Compound Interest | Chemistry infographics @compoundchem.com · 22/03/2025

I’m flying out to San Diego for #ACSSpring2025 today! Here’s a reminder of the chemistry that cleans the air you breathe on a plane in @cenmag.bsky.social: cen.acs.org/safety/consu... #ChemSky 🧪

Infographic on the chemistry oof air on a plane.
Airliners pressurize onboard air to make flights more comfortable. In the cabin, the air pressure is 75.1 kPa, compared with 101 kPa at sea level. Cabin air is a mix of fresh and filtered air and is renewed up to 30 times an hour. Filters remove bacteria, fungi, and viruses.
Airplanes cruise in the lower stratosphere, where the ozone concentration is slightly higher than at ground level. This increases cabin ozone levels, which can cause headaches and breathing problems. Many planes use devices to convert ozone in air into oxygen before it enters the cabin.
A chemical system produces the oxygen provided by masks that drop from an airplane’s ceiling in an emergency. Pulling the mask down releases a firing pin from the oxygen generator cylinder. This release ignites a mixture of an oxidizer and iron powder. The heat from burning iron decomposes the oxidizer, a process that produces oxygen. The generator produces oxygen for 15–20 min.

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CrocodileChemist @crocodilechemi1.bsky.social · 16/03/2025

I’ve been testing out ‘things that glow’ for our chemistry club. A Horse chestnut branch in water just blew my mind! Thanks @andrestrujado.bsky.social for the suggestion ages ago. The others are pumpkin, sesame and fennel seeds in vodka!

Showing blue fluorescence with a horse chest branch in water. Slight red with pumpkin seeds, blue with sesame and fennel seeds under uv light

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CrocodileChemist @crocodilechemi1.bsky.social · 15/03/2025

Here’s the pH profile of a small purple viola petal used as a cake decoration. I resisted the temptation to eat it, instead it gave itself to science! #GardenIndicators

Testing the pH colour changes of a viola petal. Pink in acid, purple/ blue at neutral pH, then a gorgeous teal at around pH 8 and into the yellows above pH 12

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Reposted by CrocodileChemist

Julian R. Silverman @manhattanscientist.bsky.social · 04/03/2025

It’s #RSCPoster day and #gardenindicators day in the lab: Is it spring yet?

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CrocodileChemist @crocodilechemi1.bsky.social · 02/03/2025

I had to buy some flowers for a practical at work, naturally I chose the ones I thought would give an interesting pH profile. Nice colour with Al ³⁺ ions too! #sciencetechnician

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CrocodileChemist @crocodilechemi1.bsky.social · 02/03/2025

Iron thiocyanate formation in a droplet. #MicroscaleChemistry is so cool!

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Reposted by CrocodileChemist

Compound Interest | Chemistry infographics @compoundchem.com · 17/02/2025

Today is #NationalCabbageDay, which is always a good opportunity to remind everyone that red cabbage can be used to make a colourful pH indicator solution! www.compoundchem.com/2017/05/18/r... #ChemSky 🧪

Infographic on making a pH indicator from red cabbage. The indicator can be made by roughly chopping cabbage, boiling, straining, and collecting the liquid. The extract contains anthocyanin pigments which give different colours in solutions of different pH, ranging from red, through purple, to green and yellow.

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CrocodileChemist @crocodilechemi1.bsky.social · 15/02/2025

Roses are red, violets are blue….pink, turquoise, green and yellow! RGB pH evaluation of a violet

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CrocodileChemist @crocodilechemi1.bsky.social · 05/02/2025

An RGB reaction plot showing ligand exchange for aqueous Cu²⁺ with sequential additions of ammonia, sodium salicylate, EDTA and catechol 💙

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CrocodileChemist @crocodilechemi1.bsky.social · 25/12/2024

A Christmas tradition and the 3rd #GardenIndicators Christmas edition - Red Cabbage! Such a wonderful range of colours at different pH. Merry Christmas everyone 🎄

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CrocodileChemist @crocodilechemi1.bsky.social · 24/12/2024

The second #GardenIndicators Christmas edition shows the pH profile of poinsettia bracts. Just look at the cheeky pink and purple in the RGB plot!

A collage of photographs showing the pH colours of poinsettia bracts. These range from pinks in acid, to browny tones in alkali and yellow at pH 13. There is an image of a plot showing the colours seen during the continuous neutralisation reaction by adding alkali to the acidified extract. It shows flashes of pinks and purples too.

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CrocodileChemist @crocodilechemi1.bsky.social · 22/12/2024

#GardenIndicators Christmas edition! I bought the cranberries purely for the science and now I’ve got to make cranberry sauce from scratch! Here’s their pH profile and the RGB plot of the acidified extract neutralised with 0.1M NaOH, then adding 2M NaOH

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CrocodileChemist @crocodilechemi1.bsky.social · 18/12/2024

The Science Techs decorated the science department and we won the school Xmas decorations competition. Great team effort. Nice to show off what we do! Snowflakes, chemistrees, stick insects, and physics interactive light generators!

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Reposted by CrocodileChemist

Iain Smellie @iainsmellie.bsky.social · 18/12/2024

We’ve made a lot of phenolphthaleins this year, so here is a multiple phenolphthalein #Chemistree #OChemistree that uses many of the compounds we made. Also featuring an illuminated fluorescein bauble at the top. All planned and made by our lab office team! (not on this platform yet).

A list of all the phenolphthaleins will be added later.

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Reposted by CrocodileChemist

Iain Smellie @iainsmellie.bsky.social · 15/12/2024

I tried a different type of #Gardenindicators experiment earlier this year. I started making bramble whisky in the late summer, this is the finished version after 3 months. Nice colour, quite a sweet taste, a bit like sloe gin. #Chemsky

Bramble whisky. I made this by soaking brambles (blackberries) in a bottle of whisky and added some sugar. I then let the mixture soak for just over 3 months.

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Reposted by CrocodileChemist

Iain Smellie @iainsmellie.bsky.social · 08/12/2024

At this time of year the number of available #Gardenindicators is more limited. However, we’ve been making some classic pH indicators too. Interesting range of colours in the methyl phenolphthalein series #Chemsky youtu.be/lcHvVRApqaQ?...

youtu.be

Colourful Phenolphthalein pH Indicator Selection

YouTube video by Gardenindicators

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Reposted by CrocodileChemist

Compound Interest | Chemistry infographics @compoundchem.com · 02/12/2024

Day 2 of #ChemAdvent24 looks at how a colour-changing indicator can be made from festive poinsettia leaves. This is possible because they contain anthocyanins, which undergo structural changes in acidic and alkaline solutions. #GardenIndicators #ChemSky 🧪

Infographic showing the different structures of the anthocyanin compounds in poinsettia plants at different pH values.

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CrocodileChemist @crocodilechemi1.bsky.social · 01/12/2024

Flower extracts store really nicely in the freezer, this one is from May. It shows the pH profile of a deep purple Aquilegia from pH1 to 13 #GardenIndicators

Showing a picture of a deep purple aquilegia flower. Then the extract is evaluated at different pHs with reds, blues and yellows. Then a continuous pattern from pink to blues and green as the acidified extract is neutralised with alkali

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CrocodileChemist @crocodilechemi1.bsky.social · 27/11/2024

Here’s a 3,5-dinitrophenol snowflake designed by our Head of Chemistry! ❄️

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CrocodileChemist @crocodilechemi1.bsky.social · 26/11/2024

Beautiful #GardenIndicators evaluation of an oxalis! Look at those colours! Wow!

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CrocodileChemist @crocodilechemi1.bsky.social · 24/11/2024

Here’s the pH evaluation of a red sweet pea from my garden. A cheeky blue around pH 8-10 is always a bonus! #GardenIndicators

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Reposted by CrocodileChemist

Andres Tretiakov @andrestrujado.bsky.social · 22/11/2024

Happy #FluorescenceFriday 😁 Following @compoundchem.com great post last week, here is another easy one. Extraction of highly fluorescent aesculin from the bark of horse chestnut twigs. Aesculin fluoresces a beautiful blue under UV illumination. #RealTimeChem SCHOOL #TECHNICIANSMAKEITHAPPEN

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CrocodileChemist @crocodilechemi1.bsky.social · 22/11/2024

Can’t wait to see if there are some crystals

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CrocodileChemist @crocodilechemi1.bsky.social · 21/11/2024

Doing a bit of prep today for our Christmas decorations with some laboratory snowflakes based on Volumetric flasks, Bunsen burners, Pear-shaped flasks and Separating funnels!

Paper snowflakes based on laboratory equipment - volumetric flasks, Bunsen burners, pear-shaped flasks and separating funnels

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Reposted by CrocodileChemist

Teresa Marx @teresamarx.bsky.social · 20/11/2024

#IteachChem 🥽 Chemistry and art: Students are investigating the effect of pH on dye color. I’m obsessed with the bright orange from annatto seeds!

An array of dyed fabric swatches show color differences at neutral, low, and high pH ranges. Dye sources include cochineal, turmeric, madder, annatto, purple corn, and red cabbage.

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CrocodileChemist @crocodilechemi1.bsky.social · 17/11/2024

Post a picture you took (no description) to bring some zen to the timeline

The picture shows a sunny day with blue skies. There is a cobweb in the foreground looking through it to a little steam and autumnal trees

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Reposted by CrocodileChemist

Simon Maechling, PhD @simonmaechling.bsky.social · 17/11/2024

Vitamin C, or ascorbic acid, is a water-soluble vitamin essential for human health. Humans can’t produce it naturally, so it’s vital in the diet. It helps form blood vessels, cartilage, muscles, and collagen. Dissolved in water and ethanol, it forms stunning crystals under polarized light.

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CrocodileChemist @crocodilechemi1.bsky.social · 17/11/2024

The #GardenIndicators project started during the first lockdown as an accessible project from home. Anthocyanins are generally pretty easy to extract… but there are a few tricky ones!

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CrocodileChemist @crocodilechemi1.bsky.social · 16/11/2024

Here’s the pH evaluation of a pink & white geranium from pH 1 to 13. The bottom image shows an RGB reaction plot, using actual RGB values to produce an image of the dynamic neutralisation reaction. Lovely purple with Al³⁺ ions too💜#GardenIndicators

Anthocyanin extracts from the flower are added to different pH solutions to produce different colours - red in acid, blue/purple neutral and green/yellow alkali

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Reposted by CrocodileChemist

Compound Interest | Chemistry infographics @compoundchem.com · 16/11/2024

There are already some brilliant chemistry and #scicomm starter packs out there (which I’ll link below) but I haven’t seen one for chemistry content creators, authors and communicators yet, so I’ve made a start on one: go.bsky.app/4Fcuzus Happy for suggestions of other accounts to add! #ChemSky

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