What actually happens during cold extraction?
Extraction is a solubility problem. Every compound in a coffee ground has a temperature at which it dissolves most readily. Heat accelerates extraction across the board, pulling out acids, bitter compounds, aromatic oils, and caffeine simultaneously and quickly. Cold water slows that process dramatically and - crucially - prevents certain compounds from forming at all. The steep time for cold brew typically runs 12 to 24 hours, depending on the grind size, coffee-to-water ratio, and whether the grounds sit in a refrigerator (slower extraction) or at room temperature (faster). Most concentrate recipes land around 1:4 coffee to water by weight; ready-to-drink ratios run closer to 1:8 to 1:12.Why does cold brew taste less bitter and acidic?
The acid and bitterness differences between cold brew and hot brew come down to which compounds extract at which temperatures. Volatile acids - including acetic acid and formic acid - require heat to volatilize and dissolve into the brew. Cold water leaves them largely locked in the grounds. Quinic acid is particularly important. It does not exist in green coffee. It forms during roasting and then continues to form in the brewing vessel when chlorogenic acids break down under heat. Quinic acid is primarily responsible for the sharp, astringent bitterness most people associate with stale or over-extracted coffee. Cold brew produces almost none of it. Malic and citric acids - the fruit-forward acids that give some coffees brightness - are water-soluble at lower temperatures and do extract in cold brew, though at lower total concentrations. This is why cold brew reads as naturally sweet and smooth rather than flat: a small amount of pleasant acid survives; the harsh acids do not. The net result, confirmed by Rao and Fuller (2018, Scientific Reports), is lower titratable acidity across the board. For drinkers who experience acid reflux, stomach sensitivity, or tooth enamel concerns, this is a meaningful difference, not a marketing claim.Does cold brew have less caffeine?
This is one of the most persistent misconceptions about cold brew. Caffeine is highly water-soluble at any temperature. Given enough contact time - and 12 to 24 hours is a long time - cold water extracts a substantial portion of available caffeine from the grounds. Additionally, most cold brew recipes use significantly more grounds per unit of water than standard drip ratios. Concentrate-style cold brew can use two to three times as much coffee by weight. The result is that cold brew is often higher in caffeine per ounce than hot-brewed coffee, not lower. Decaf cold brew eliminates this variable entirely. If you are making cold brew because you want the smooth, low-acid profile but need to limit or avoid caffeine - whether for sleep, health, or personal preference - decaf grounds remove the guesswork.Why does grind size matter so much for cold brew?
Grind size controls the surface area exposed to water and the rate of extraction. Hot brew compensates for under- or over-extraction quickly because heat accelerates the process. Cold brew has no such buffer - it relies entirely on time and surface area. A fine grind in cold brew creates too much surface area. Over 12 to 24 hours, the result is over-extraction even at low temperature: bitter, muddy, sometimes astringent. A fine grind also makes filtration difficult, producing cloudy brew with sediment. A coarse grind - similar to what you would use for a French press, typically around 900 to 1,000 microns - exposes less surface area and extracts more slowly. This produces the clean, smooth concentrate that cold brew is known for and filters easily through standard mesh or paper. Purchasing pre-ground cold brew coffee calibrated to the right grind size removes one variable from the equation.What Colipse Coffee offers for cold brew
How each product helps
Decaf Cold Brew Grounds are ground specifically for cold extraction - coarse enough to avoid over-extraction over long steeps, fine enough to extract fully within a 12 to 24 hour window. The coffee is decaffeinated using the Swiss Water® Process, which uses no chemical solvents. Swiss Water® Process works by removing caffeine through a water-based osmosis system that preserves coffee flavor compounds, which matters especially for cold brew because cold extraction already produces a subtler flavor profile than hot brew. Starting with well-decaffeinated coffee that still carries intact flavor compounds is the baseline requirement. For acid-sensitive drinkers, this combination - cold extraction plus Swiss Water® decaf - removes both the acid burden and the caffeine burden without requiring flavor sacrifice.What ratio should I use for cold brew concentrate?
What ratio should I use for cold brew concentrate?
A standard concentrate ratio is 1:4 coffee to cold water by weight - so 100 grams of grounds to 400 grams of water. To drink, dilute 1:1 with water or milk. For ready-to-drink strength, use a 1:8 ratio at the brew stage. Adjust based on personal preference after your first batch.
Should I steep in the refrigerator or at room temperature?
Should I steep in the refrigerator or at room temperature?
Both work. Room-temperature steeping extracts faster - 12 to 16 hours is usually enough. Refrigerator steeping is slower and often used for 18 to 24 hours. Room-temperature cold brew carries a slightly higher risk of bacterial growth if you let it go beyond 24 hours, so refrigerate promptly after straining. Refrigerator steeping is the safer default if you are not monitoring closely.
Is cold brew safe for people with acid reflux or GERD?
Is cold brew safe for people with acid reflux or GERD?
Cold brew’s lower titratable acidity (Rao & Fuller, 2018, Scientific Reports) makes it a commonly tolerated alternative for people who find hot coffee irritating. However, individual tolerance varies and coffee is not appropriate as a medical recommendation. Decaf cold brew removes caffeine, which can also act as a lower esophageal sphincter relaxant independent of acid content. Consult a healthcare provider if you have a diagnosed condition.
How long does cold brew keep after brewing?
How long does cold brew keep after brewing?
Strained cold brew concentrate keeps well refrigerated for 7 to 14 days. Ready-to-drink diluted cold brew is best consumed within 3 to 5 days. Do not leave strained cold brew at room temperature for extended periods.
Does the Swiss Water® Process affect cold brew flavor?
Does the Swiss Water® Process affect cold brew flavor?
Swiss Water® Process removes caffeine while retaining the non-caffeine flavor compounds that give coffee its taste. Because cold extraction already produces a smoother, lower-intensity cup, the flavor profile of Swiss Water® decaf works well for cold brew - the subtle notes that cold extraction preserves are intact in the green coffee before roasting.
Can I use any coffee grind for cold brew?
Can I use any coffee grind for cold brew?
Pre-ground Decaf Cold Brew Grounds are calibrated to cold brew coarseness, so no adjustment is needed. If you grind your own, target a coarse grind similar to French press. A finer grind will produce over-extracted, bitter, and cloudy results even with decaf coffee.