Of everything I sell, slate pencils have by far the least exotic backstory.
No sacred hillside. No 17th century aristocracy. No two and a half million years of wind. They were school equipment. Millions of children had one on the desk in front of them, and a fair few of those children put it in their mouths, and here we all are.
Which, to me, makes them more interesting rather than less. This is the one product in the shop where the path from ordinary object to community favourite is completely visible.
First, what they're actually made of
A slate pencil is not a stick of roofing slate, which is the assumption a lot of people arrive with.
They're cut from soft sedimentary stone, usually shale, and historically also from soapstone or chalk depending on what was local. Soft enough to leave a mark on a slate board, hard enough to hold a point. That's the whole design brief.
Shale is a fine-grained layered rock, and that layering is exactly what you feel when one snaps. It doesn't shatter like a fired terracotta chip and it doesn't collapse into powder like loess. It fractures along its bedding planes, which is why the break feels structured rather than random, and why people describe it as layered rather than just crunchy.
That's also why slate behaves consistently batch to batch in a way raw dirt clays never do. It's a rock with a grain.
The classroom bit
Writing slates turn up in Indian schools remarkably early. Alberuni, writing in the 11th century, describes students in India writing with a white material on a dark surface, left to right. So this is a thousand-year-old setup, not a colonial import.
Europe caught on properly later. Wales became the big slate hub in the late 18th century, and by the 19th century writing slates were in use in more or less every school on earth. They started getting phased out from around the 1930s as paper got cheap.
The difference is that India kept going. Generations of Indian schoolchildren learned to write on a slate with a slate pencil long after the West had moved on to exercise books and biros, and in plenty of places it never fully stopped. If you grew up with a takhti or a slate board, that pencil was in your hand every single day for years.
Years. On your desk. Within reach. Hold that thought.
Where they come from, and how they're made
The centre of the world for this is Mandsaur district in Madhya Pradesh. The slate pencil industry is officially described as the main industry of the district, which is a genuinely odd thing to be able to say about a writing implement. Mandsaur's other major product is opium, which I mention purely because it is the funniest possible pairing on a district's economic summary.
There's production in Neemuch nearby, in parts of Rajasthan around Udaipur, and down in Markapur in Prakasam district, Andhra Pradesh, which has its own long-standing slate trade.
The traditional process is straightforward and brutal in equal measure. Shale is quarried in blocks. The blocks get split along their natural layers, cut down into rough rods, and then ground and sanded to size and shape. Cut, grind, sand, pack. Most of it happens in small workshops rather than big factories, and a lot of it is done by hand or on simple machinery.
There's a second route worth knowing about, because it matters more to you than it does to a schoolkid. Some modern slate pencils aren't cut from stone at all. The slate gets crushed to powder, mixed with a binder (clay or starch), extruded into rods, dried and polished. You end up with something that looks identical and writes the same, but is a reconstituted product with something else in it.
The part I'd rather not skip
Cutting and grinding shale makes an enormous amount of dust, and that dust contains crystalline silica.
Slate pencil workers get silicosis. Not occasionally, and not as a fringe concern. It's been documented since at least the 1970s, when a study looked at 151 people working in slate pencil manufacturing in Mandsaur and found both the incidence and the severity tracking straight up with how long someone had been doing the job.
Here's the detail that really landed for me, though. Madhya Pradesh passed the Slate Pencil Workers Welfare Fund Act in 1982 and set up a dedicated welfare board, specifically for slate pencil workers in Mandsaur district, explicitly because of silicosis. A state government wrote a law for one industry in one district. You don't do that unless the situation is genuinely bad.
I want to be precise about what this does and doesn't mean, because I'm not interested in scaring anybody.
Silicosis is a lung disease. It comes from breathing fine stone dust, day after day, for years, in a workshop with no extraction. It is a disease of the people cutting the stone, not of the people holding the finished pencil. Nobody has ever got silicosis from a slate board.
But I think if you're going to enjoy something, you should know how it gets to you. Somebody cut that. It's also, honestly, part of why I care so much about who I buy from and whether they can tell me anything about their supply chain. I can't fix an industry from a spare room in the UK. I can at least not pretend the industry is charming.
So why does anyone eat them?
Ask a Western crunching community this and you'll get the answer straight back, because the exact same thing happened here.
Blackboard chalk. Chalk pencils. Every school had them, and a decent percentage of children had a go at one. Some got told off and stopped. Some quietly never did. If you've been in this community a while you'll have seen the pattern in a hundred introductions: it started at school, with the chalk.
Slate pencils are that story, at Indian scale, over a much longer stretch of time. A soft mineral stick, on a child's desk, every day, for the entirety of primary school. Some of those children liked the chalky snap and the cool dusty taste, and some of those children grew up and never stopped liking it.
So a lot of the demand isn't really curiosity. It's memory. For plenty of Indian and South Asian crunchers, a slate pencil isn't an exotic clay, it's the literal taste of being seven. I've had messages from people describing the smell of a wet slate board with the kind of detail you only get from something that's been sitting in your head for thirty years.
I find that genuinely lovely, and it's a decent counter to the idea that this community is doing something strange. Half the planet's schoolchildren had a go at the stationery. Most people stopped. Some of us are just still here.
The colours, and what they mean
White is the classic and by a distance the most popular. It's what most people picture, it's what most Indian classrooms used, and it's the one I sell the most of. Clean, chalky, layered, mild.
Then you've got red, pink and black, all fairly widely available. Red and pink pencils are usually iron-rich, which is where the rust tones come from, and they tend to taste more mineral and metallic with a wet-earth note behind them. Black leans smoky and cementy, denser and more serious, and to me it's the one that divides people most sharply.
Yellow and green are the rare ones. You see them turn up in mixed packs more often than on their own, and if you're after a specific colour they're the two you'll be waiting for.
One thing worth knowing about colour, and I'd rather raise it than have you assume. Colour in natural shale comes from what's in the rock, mostly iron for the reds and pinks, and organic carbon for the greys and blacks. But not every coloured slate pencil on the market is naturally coloured. Some are pigmented, particularly the brighter and more uniform ones, because they were made to be attractive stationery rather than to be eaten.
I'm not going to pretend I can always tell by looking. Neither can you. It's a fair question to put to any seller, and if the answer is vague, that tells you something.
What I've got, honestly
The slate side of the shop is having a rough month on stock, so I'd rather be upfront than send you to a page full of sold-out buttons.
Right now there is exactly one bag of White Slate Pencils left, 100g thick cut. That's it on the pencils proper. Black, Red, the branded White/Mixed multipack and the White Slate Bars are all sitting at zero. The slate sticks and slate balls from Rose Clay are mostly out too, though Black Slate Sticks and the White and Black Slate Balls have a few left between them.
If you're after slate specifically, watch the restock notices rather than the shop page. And if you want a sense of the range without committing, the Mixed Slate Sticks are the ones that give you five colours in one go when they're in, which is the closest thing I've got to a slate sampler.
One last thing
The thing I keep coming back to with slate pencils is how unremarkable they were supposed to be.
Nobody set out to make a sensory product. Somebody needed to write on a board, so they cut a soft rock into a stick, and then a thousand years of schoolchildren did what schoolchildren do. The whole category exists by accident.
Most of the best things do.
Ta x
Disclaimer: This is written for informational and hobbyist purposes. My clay and chalk products are natural materials sold for sensory, hobbyist, collection and ASMR use only. They aren't certified food-grade, and I don't sell them as food, supplements or medicine. This article is general information based on my own research, not medical advice, and I'm not a doctor. Natural stone, clay and chalk vary in composition and can contain naturally occurring minerals and contaminants. The silicosis described above is an occupational lung disease affecting workers who inhale stone dust during cutting and grinding, and nothing here should be read as a claim about what happens when a finished product is handled or consumed. Any consumption is entirely a personal decision and entirely at your own risk. I don't promote ingestion and can't be held responsible for any adverse effects. If you have any concerns about pica, geophagia or ingesting non-food materials, please speak to a GP or another qualified healthcare professional.
Sources
● Wikipedia, “Slate (writing)” (Alberuni's 11th-century account, pencil materials, Welsh production, decline from the 1930s): https://en.wikipedia.org/wiki/Slate_(writing)
● District Administration Mandsaur, Government of Madhya Pradesh, “Slate pencil”: https://mandsaur.nic.in/en/district-produce/slate-pencil/
● Wikipedia, “Mandsaur district” (opium and slate pencil as the district's key industries): https://en.wikipedia.org/wiki/Mandsaur_district
● Madhya Pradesh Slate Pencil Workers Welfare Board, under the MP Slate Pencil Workers Welfare Fund Act 1982: https://labour.mponline.gov.in/portal/services/Shramsewa/MpSlatePencil.aspx?langid=2
● “Silicosis prevalence and related issues in India: a scoping review”, Journal of Occupational Medicine and Toxicology (citing Jain et al. 1977, 151 slate pencil workers in Mandsaur): https://pmc.ncbi.nlm.nih.gov/articles/PMC11776177/
● Saiyed et al., “Silicosis in slate pencil workers: an environmental and medical study”, American Journal of Industrial Medicine 1985: https://onlinelibrary.wiley.com/doi/10.1002/ajim.4700080207
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