# Heisenberg concentrate: mixing rate and steep time > Heisenberg concentrate: 15 to 20 per cent depending on the source, 1 to 7 days of steeping. Mixing rates, steep windows and storage that hold up. A cool fruit mix does not mature the way a dessert does. The freshness reads on day one, the depth of the berries arrives much later, and tasting too early leaves an impression of menthol on its own. The **Heisenberg concentrate** from Vampire Vape concentrates that problem perfectly, because the steep times published for it in Britain run from one day to well over a week depending on who you ask. ## How long to steep a Heisenberg concentrate Vampire Vape, the British house that formulates the flavour, publishes a steep time of five to seven days on its own mixing blog, alongside a general recommendation of at least seven days for its more complex one shots. That is the best documented window available. Several British stockists print shorter figures. One to three days appears on a number of concentrate listings, three to five days on others. Those values describe the point at which the mix becomes homogeneous and pleasant, not the point at which it settles into balance. In practice, plan for a week and taste three times: at forty eight hours, at five days, and at eight days. You will watch the freshness step back a notch while the berries gain body. Write down the day that suited you, because that is your personal reference for every bottle after this one. ## The rate the maker publishes for a Heisenberg concentrate Vampire Vape gives a range of fifteen to twenty per cent for its **Heisenberg concentrate**, and points out that the figure is a synthesis of what mixers actually do rather than a laboratory instruction. That nuance is almost never repeated by the shops that quote the number. The brand adds a concrete piece of advice: drop towards fifteen per cent if the menthol feels dominant, and cut a further two or three points if the mix comes across as harsh. Retailers reflect the same logic from the other direction, with several listing ten to twenty per cent and suggesting the lower half of that band for high propylene glycol mixes. One long running British forum thread has mixers running it at anywhere from sixteen to twenty five per cent. That spread mostly tells you the formula tolerates adjustment well, provided you start at the bottom and work up rather than the reverse. ## Turning those rates into volumes The conversion is always done on the finished volume, never on the amount of base you have already poured. It is the single most common arithmetic slip on a mixing bench. For 10 ml at fifteen per cent, that is 1.5 ml of concentrate, or roughly forty five drops from a standard nozzle. For 30 ml, it is 4.5 ml, and the syringe should have taken over from the dropper by then. For 100 ml, it is 15 ml, measured by syringe or by scales. The rough equivalence of thirty drops per millilitre depends on the nozzle and on the viscosity of the liquid. Past 10 ml it becomes too imprecise to reproduce, which is exactly the point at which a batch stops being a trial and starts being worth repeating. ## Why menthol profiles behave differently as they steep The cooling molecules are light and volatile. They distribute through the base almost immediately and are perceptible from the moment you finish shaking. The fruit compounds are heavier and take considerably longer to diffuse. That difference in speed explains the imbalance of the first few days. A mix tasted at twenty four hours seems mentholated and hollow, not because the rate is wrong but because part of the recipe has not expressed itself yet. Vegetable glycerine amplifies the effect. The richer the base is in glycerine, the slower the diffusion and the longer the rebalancing window, so the same recipe at 30 PG and 70 VG needs several more days than the 70 PG version. That relationship between ratio and timing is set out in full in our guide to the [DIY base](/uk/diy-base/). ## Bottles, air and the freshness you lose A cool concentrate loses freshness every time the bottle is opened. On this profile that is the most sensitive storage variable of all, ahead of light and ahead of temperature. Fill the bottle close to its capacity to limit the volume of trapped air. Amber glass remains the sensible choice for anything you intend to keep for months, while PET is perfectly adequate for a bottle you will empty in a few weeks. Store the lot dry, away from light and away from heat, with every bottle out of reach of children and animals. Shake hard once after mixing, then leave it alone. Daily shaking does not speed up steeping in any measurable way and it costs you freshness. If you plan three staggered tastings, mix slightly more than you need and draw small samples into a separate test bottle. The main bottle then stays sealed for the whole steep, which sounds excessive on an ordinary fruit and genuinely changes the outcome on a menthol. ## What the nic shot does to your ratio British mixing is built on shortfills and nic shots, so the base you chose is never the whole story. Nicotine containing liquid is capped at 20 mg per ml and refill bottles at 10 ml, which means a single shot carries at most 200 mg of nicotine. The method is a division rather than a lookup. Total nicotine divided by total finished volume gives the strength of the mix, and the answer is whatever the arithmetic says it is. Wear gloves whenever you handle a shot, and treat spillage on skin as something to rinse immediately rather than wipe. The part that catches people out is volume. Ten millilitres of shot inside a 60 ml bottle is a sixth of the liquid that is not your chosen base, and the shot carries its own ratio, commonly full VG or 50/50. A mix planned as 50/50 can finish several points to one side without anyone noticing. ## The mixing mistakes this profile punishes The formula blends red fruits, dark grape and menthol, an assembly that forgives imprecision on the fruit and none at all on the cooling. A handful of habits will save you a bottle. Adding a cooling agent on top of a concentrate that already contains menthol is the first. Concluding after twenty four hours that the mix is underdosed and topping up the flavour is the second, and it produces a saturated liquid a week later. Reusing a syringe that has handled a dessert is the third, because traces of vanilla or caramel sit badly against this profile. Label every bottle with the rate, the base and the date you filled it. Three trials of the same recipe look identical on a bench, and comparing two unlabelled bottles is comparing two unknowns. ## Frequently asked questions ### Does this flavour exist in several versions? Yes, the brand has built variants around the original formula over the years. They do not share the same recommended rate or the same behaviour during a steep, so treat each listing separately. ### Can it be paired with another concentrate? It is possible but awkward, because the formula is already a complete assembly of several notes. A successful pairing means cutting both concentrates noticeably rather than adding one on top of a full rate. ### Does the freshness fade with storage? Yes, gradually, and mostly on a bottle that gets opened often. A mix kept for several months loses perceived coolness while the fruit part stays comparatively stable. ### Should the mix be filtered or decanted? No, that serves no purpose on this kind of formula. Visible sediment or separation usually points to a concentrate that was not shaken properly, or to storage at too low a temperature. ### What hardware suits this profile best? Mouth to lung setups running a mid value coil hold the freshness well. Higher power tends to push the menthol forward at the expense of the fruit, which is the opposite of what a long steep was for. ## Getting the steep right on a cool fruit mix A **Heisenberg concentrate** is mixed between fifteen and twenty per cent depending on your base, and asks for roughly a week before the fruit catches up with the freshness. The shorter figures quoted here and there are not wrong, they simply describe an earlier stage of the same curve. Method counts for more than any exact number. Three spaced tastings, a label on the bottle, a rate written down before it is poured. That is the same bench discipline that makes sense of a contradictory listing like the [Red Astaire concentrate](/uk/red-astaire-concentrate/), or of a sweet profile such as the [cotton candy flavour concentrate](/uk/cotton-candy-flavour-concentrate/), and it is what turns a Heisenberg concentrate into something you can repeat rather than rediscover. Editorial content for adult readers only. Vaping products usually contain nicotine, a substance that causes addiction. Not for sale to under-18s in the United Kingdom. This article is not a buying recommendation.