Because you're not buying spirulina. You're buying the blue extracted from it. Put a kilogram of green spirulina next to a kilogram of blue spirulina and the difference in price can look slightly absurd. They're both made from spirulina. One is green, one is blue. How much more complicated could the blue one possibly be? Quite a bit, as it turns out.
Making green spirulina is where making blue spirulina starts
To make ordinary spirulina powder, spirulina is grown, harvested, concentrated and dried.
You now have green spirulina powder.
To make blue spirulina, harvesting the spirulina is only the first half of the job.
What we're interested in is phycocyanin, the naturally blue pigment-protein inside the spirulina cells. It has to be extracted from the biomass and separated from the chlorophyll, cell material and everything else that makes whole spirulina green.
The resulting blue extract then has to be clarified, concentrated and eventually dried back into a powder.
So you're taking an already cultivated ingredient, extracting one particularly interesting part of it, and turning that part into another ingredient entirely.
That costs more.
Most of the spirulina isn't the bit we want
This is probably the easiest way to understand the price difference.
A kilogram of harvested spirulina does not become a kilogram of blue spirulina.
Phycocyanin is only one component of the biomass. When you're making blue spirulina, much of the material you spent time and money growing isn't going into the final blue extract.
You're paying for the spirulina that was grown and for the work required to get the blue out of it.
The concentration of the final powder matters too. Blue spirulina is sold in different grades, and stronger extracts require more phycocyanin in every kilogram of finished product.
Generally, the more concentrated the blue, the more expensive the powder becomes.
Getting something blue is the easy part
Extracting blue liquid from spirulina isn't the same thing as making a good commercial blue spirulina powder.
The colour has to survive extraction, concentration and drying. The finished powder needs to dissolve properly, have useful colour strength and remain consistent enough that buying a new batch doesn't completely change whatever you're making.
And phycocyanin isn't an indestructible synthetic pigment. It's a protein.
That makes the way it is extracted and processed important.
There's a lot happening between a tank of green spirulina and the tiny packet of intensely blue powder sitting on your counter.
But the price per kilogram is also a little misleading
This is the part that matters if you're actually planning to use it.
Blue spirulina is expensive by the kilogram.
You also use very, very little of it.
Suppose you're making a 250 ml blue latte and settle on 0.25 g of blue spirulina per drink.
A 50 g pack gives you about 200 drinks.
If that 50 g pack costs ₹1,999, that works out to about ₹10 per drink.
Suddenly, a powder that costs nearly ₹40,000/kg is adding roughly ten rupees to the drink in front of you.
And 0.25 g isn't a universal recipe. Some pale drinks will look great with less; some products will need more. That's why we recommend testing the amount in whatever you're actually making.
But it illustrates why the kilogram price doesn't tell the whole story.
A little goes a very long way
The same logic applies outside drinks.
If a pale gelato works well at around 1 g of blue spirulina per kilogram of mix, a 50 g pack is enough for roughly 50 kg of gelato.
If your frosting needs around 0.1 g per 100 g, the same pack can colour roughly 50 kg of frosting.
That's one of the peculiar things about buying blue spirulina.
The packet is small. The price per kilogram is high. And then you open it and discover that your first experiment requires an amount barely worth putting on the scale.
For a cafe, bakery or gelato shop, cost per batch is usually a much more useful number than cost per kilogram.
Why are some blue spirulina powders much cheaper than others?
Because blue spirulina doesn't describe one standard powder.
Different products can contain different amounts of phycocyanin-rich extract. They can have different colour strengths, different levels of purification, and different carriers or stabilising ingredients.
So two blue powders at ₹20,000/kg and ₹40,000/kg aren't necessarily equivalent ingredients with one supplier charging twice as much.
A cheaper powder isn't automatically worse, either. A lower-strength grade may be exactly what a particular application needs.
The useful comparison is what's actually in the powder, how strong it is, and how much you need to get the result you want.
If one powder costs half as much but you need twice as much of it, the dramatic price difference has mostly disappeared.
So, is blue spirulina expensive?
Yes.
Compared with ordinary green spirulina, absolutely.
Compared purely by the kilogram with synthetic food colours, very often.
But that's not a particularly useful comparison if you're making a latte, a tub of gelato or a batch of frosting.
You're buying a concentrated natural blue extracted from a much larger amount of green biomass.
And you're probably using a fraction of a gram at a time.
Don't ask what the kilogram costs.
Ask what it costs to make something blue.
FAQ
Why does blue spirulina cost more than green spirulina?
Green spirulina is the whole dried biomass. Blue spirulina is made by extracting the phycocyanin-rich blue fraction from that biomass, then clarifying, concentrating and drying it into a powder.
Is PrismaBlu expensive to use in a drink?
The kilogram price looks high, but the dose is small. If a 250 ml drink uses about 0.25 g, a 50 g pack makes roughly 200 drinks, so the cost per drink is often the more useful number.