Low-Temperature Ground Cacao: What Actually Changes
Low-temperature ground cacao means the nib is refined into a liquid mass while the machine is kept cool, instead of being allowed to run hot on its own friction. What that changes is documented, and it is narrower than the marketing suggests: it is a flavour and volatile-chemistry story, and the heat that does most of the damage to cacao happens long before anything reaches a grinder.
Grinding temperature is also the one number in this chain that almost nobody publishes. A pack will say "low temperature" without saying what the temperature was, which is a claim with no specification behind it. Here is what the measured work actually shows.
What grinding does to a nib
Cacao nib is roughly half fat. Put it under granite rollers and the cell walls break, the cocoa butter is released, and the solid particles are progressively reduced until the mixture stops feeling gritty on the tongue. The threshold people usually quote is about 30 microns, because that is roughly where the human palate stops detecting individual particles.
Clark and colleagues, in Scientific Reports in 2020, ran 350 g of nibs in a bench-scale melanger and measured particle size with a grindometer at intervals. All samples at eight hours and beyond were below 30 microns, with the majority range at eight hours recorded as 20 to 25 microns and none below 15. So the texture job is largely finished early. Everything after that is flavour.
Temperature and time are not equally important
The same study is the most direct evidence on grinding temperature available. The authors held the melanger at 16, 24 and 38 degrees C in an incubation chamber and sampled at 0, 8, 16 and 24 hours, giving 36 samples in all, then profiled volatiles by headspace solid-phase microextraction gas chromatography mass spectrometry and annotated 88 compounds.
Analysis of variance found that 86 of the 88 compounds varied with time, 59 with temperature, and 53 with the interaction of the two. The authors conclude that "these data support that time is a critical factor in determining the aroma chemistry of chocolate". Their model for temperature was weaker, with a Q squared of 59.2%, which they read as temperature not being predictable from the volatile profile.
Individual compounds moved in different directions. Dimethyl sulphide was high at zero hours and had nearly disappeared by eight. Tetramethyl pyrazine and most pyrazines decreased over time, as did benzaldehyde and 2-methylpropanal. Maltol increased, 3-acetyl-1H-pyrroline rose to moderate or high levels by 24 hours, and aldehydes as a class were more temperature-dependent than other groups.
Three limitations are worth carrying. This was a bench-scale melanger, and the authors say scalability to full-size machines is untested. No sensory panel was run, so the flavour progression they predict is unconfirmed. And the data are relative abundances, with identifications at a confidence level that falls short of authentic-standard confirmation.
The heat that matters most happens earlier
Payne and colleagues, in the Journal of Agricultural and Food Chemistry in 2010, tracked epicatechin and catechin across fermentation, drying, roasting and alkali treatment. Fermentation alone reduced both by more than 80%. Drying had little effect. Roasting showed clear epicatechin loss once bean temperatures went above about 70 degrees C, and roasting to 120 degrees C raised catechin by 640 to 696% against the same unroasted beans, which the authors attribute mainly to epimerisation of epicatechin rather than to anything new being created.
Alkali treatment was the heaviest intervention of all: compared with natural cocoa powders, Dutch processing reduced epicatechin by up to 98% and catechin by up to 80%. The authors propose the ratio between the two as a sensitive indicator of a bean's processing history, which is a neat idea, because it means a laboratory can read backwards from a powder to how it was treated. That is the same territory as what alkali treatment does to a cocoa powder.
Note what this study is not. It measured beans and cocoa ingredients, not finished chocolate from a cooled grinder, and it did not test grinding temperature at all. Nobody should read a roasting result as a grinding result, and we are not going to print a flavanol figure for Chaski, because we have not measured one.
What the words on a pack can and cannot tell you
| Phrase | What it specifies |
|---|---|
| "Raw" | No stated temperature or stage |
| "Low temperature" | Nothing unless a figure and a stage are given |
| "Stone ground" | The type of mill, not the temperature |
| "Conched 72 hours" | A time, which the 2020 study suggests matters more than temperature |
| "77% cocoa solids" | A declared composition figure you can compare |
The practical move is to ask which stage a temperature claim refers to. Fermentation, drying, roasting, refining and conching are five different heat events, and a brand that says "low temperature" about one of them is silent about the other four. The distinction between an unroasted powder and a conventional one is covered in raw cacao against cocoa powder, and the wider argument sits in the raw versus heated cacao debate.
What is in a Chaski tube
The cacao in Chaski Cacao is low-temperature ground. The tube holds 600 g of 77% dark buttons made with single-origin Peruvian and Ecuadorian cacao and coconut sugar, with Lion's Mane as a fruiting body extract and Cordyceps sinensis. There are no emulsifiers, no seed oils, no palm oil and no added cane sugar, and the daily dose on the pack is four buttons.
The button shape changed in mid-2026. The recipe did not change with it, which is worth saying plainly because a reshape is exactly the moment a brand quietly reformulates. A button softens in the hand before it softens on the tongue, which is a property of cocoa butter rather than of anything we did to it.
Every batch is tested for lead, cadmium and pesticides. The rest of the library is indexed on the Chaski guides page.
Frequently Asked Questions
What does low-temperature ground cacao actually mean?
It means the refining stage, where nib is milled into a smooth liquid mass, is run with the machine kept cool rather than allowed to heat on its own friction. It is a description of one stage of processing, not a legal category, and it says nothing about fermentation, drying or roasting, which are separate heat events earlier in the chain. A claim is only checkable if the brand states a temperature and the stage it applies to.
Does grinding temperature change the flavour of chocolate?
The measured evidence says time matters more. Clark and colleagues, in Scientific Reports in 2020, held a bench-scale melanger at 16, 24 and 38 degrees C and sampled at 0, 8, 16 and 24 hours. Of 88 annotated volatile compounds, 86 varied with time and 59 with temperature, and their statistical model for temperature was not predictive. The study used a laboratory machine, ran no sensory panel, and reported relative rather than absolute abundances.
At what temperature do cocoa flavanols start to degrade?
Payne and colleagues, in the Journal of Agricultural and Food Chemistry in 2010, reported clear epicatechin loss when bean temperatures during roasting exceeded about 70 degrees C. Roasting to 120 degrees C raised measured catechin by 640 to 696% against unroasted beans, which they attribute mainly to epicatechin converting to catechin. Fermentation reduced both compounds by more than 80% before roasting even began. Those figures are for beans and cocoa ingredients, not for finished chocolate from a cooled grinder.
How long does cacao need to be ground to stop feeling gritty?
Around eight hours in the setup the 2020 Scientific Reports study used. Measuring with a grindometer, the authors found all samples at eight hours and beyond sat below 30 microns, with the majority range at eight hours recorded as 20 to 25 microns and none below 15. Roughly 30 microns is the figure usually quoted as the point where the palate stops picking out individual particles. Grinding past that point is about flavour chemistry rather than texture.
Is Chaski cacao low-temperature ground?
Yes. The cacao in Chaski Cacao is low-temperature ground, and the tube holds 600 g of 77% dark buttons made with single-origin Peruvian and Ecuadorian cacao and coconut sugar, with no emulsifiers, no seed oils, no palm oil and no added cane sugar. We do not publish a flavanol or polyphenol figure for it, because it has not been measured, and an unmeasured number on a page is decoration. Every batch is tested for lead, cadmium and pesticides.
Sources
- Clark C, Bettenhausen HM, Heuberger AL, Miller J, Yao L, Stone M, Scientific Reports, 2020
- Payne MJ, Hurst WJ, Miller KB, Rank C, Stuart DA, Journal of Agricultural and Food Chemistry, 2010