What Is the Difference Between Bactoferm Mold-600 and T-SPX?

Bactoferm Mold-600 and T-SPX both come in 25g sachets, both sit in the cultures section, both cost the same — and that's where the similarity ends. One goes inside the meat. One goes on the outside of the casing. They do completely different jobs at different stages, and for a traditional European-style salami you need both.  T-SPX is a fermentation starter culture. You mix it into the meat before stuffing, and it drives controlled fermentation from the inside out. Mold-600 is a surface mould culture. You dissolve it in water, spray or dip your stuffed casings, and it builds a white mould coat on the outside of the salami during the hang. Neither one is a curing salt. Neither replaces Cure #1 or Cure #2.

What T-SPX does:

T-SPX is a slow-fermentation starter culture. You mix it into your meat with the salt, spices, and cure before stuffing, and it gets to work converting the sugars you've added into lactic acid. That drop in pH is what drives fermentation safely — instead of relying on whatever wild bacteria happen to be floating through your garage, you're controlling the process with a known culture.  The slow-fermentation point matters. T-SPX works at 18–24°C and produces a mild, rounded flavour rather than the sharp acidity you get from fast-ferment cultures. It also helps the meat hold its red colour through the cure. One 25g sachet treats up to 100kg of meat. It suits traditional slow-fermented salami and mild or Spanish-style chorizo — anything where you want a gentle ferment and a developed but not punchy flavour profile.  T-SPX does not protect the surface of the salami. It does nothing for mould control. Its job is done inside the meat well before the salami goes into the drying chamber.

What Mold-600 does:

Mold-600 is a surface mould culture, not a meat culture. After you've stuffed and tied your salami, and before it goes into the drying chamber, you dissolve the 25g sachet into 1–2 litres of water at 20°C, let it sit for two hours, dilute up to 10 litres total, then spray or dip the casings. The whole solution gets used the same day it's mixed.  What grows on the surface is a white to light grey mould coat. It looks like the bloom you see on a good European-style salami — and it's doing three things at once.  First, it outcompetes wild moulds and yeasts. Without it, the surface of your salami is open territory. Over a 4–6-week hang, the wrong strains can take hold — green, black, or orange mould that either ruins the batch or makes you genuinely uncertain whether it's safe. The Mold-600 coat gets established early and crowds them out.  Second, it slows and evens moisture loss from the surface. We've found that a well-established mould coat reduces the risk of case hardening — where the outer layer of the salami dries too hard, too fast, and traps moisture inside. When the outside seals before the inside has dried, the whole drying process breaks down. A living mould coat breathes differently to bare casing.  Third, it contributes flavour. The mild mushroom-like aroma of a traditional European salami comes partly from the mould coat, not just the spice blend.  Mold-600 stores frozen at -17°C in dry form, the same as T-SPX. Once you've mixed the spray solution, use it that day — it doesn't keep.

Do you need both?

For a traditional slow-fermented salami: yes. T-SPX handles fermentation. Without it, you're leaving that stage to ambient bacteria, which means unpredictable pH development, unpredictable flavour, and a process that's harder to run safely.  Mold-600 handles the surface. Without it, you're hanging a bare casing in a drying chamber for weeks and hoping nothing bad takes hold. The risk isn't just aesthetic — green or black mould appearing partway through a 6-week hang means pulling the batch and working out whether you've got a surface contamination or something that's gotten through to the meat.

 Skip T-SPX and the ferment is a coin toss — you might get lucky, or you might pull a batch at week two that never dropped pH and isn't safe to eat. Skip Mold-600 and you're watching the surface for six weeks hoping the green stuff doesn't beat the white stuff to it.  One clarification worth making: neither of these products is a curing salt. T-SPX does not replace Cure #2 in a slow-fermented salami. Mold-600 doesn't protect the interior of the meat from bacterial growth during the long dry. The cure — Cure #2 — is a separate, non-optional ingredient. T-SPX and Mold-600 do their jobs only when the cure has been correctly applied first.

FAQ

Do I mix Mold-600 and T-SPX together?

No. They go on at different stages. T-SPX gets mixed into the meat with your other ingredients before stuffing. Mold-600 goes on the outside of the stuffed casing before it goes into the drying chamber. They never contact each other directly.

 When exactly does Mold-600 go on?

After stuffing and tying, before the salami goes into the drying chamber. Dissolve the 25g sachet into 1–2 litres of water at 20°C, let it sit for two hours, dilute to 10 litres total, then spray or dip the casings. Use the whole solution the same day.

 Can I use one without the other?

Technically yes, but you're leaving a gap in the process. T-SPX without Mold-600 means you've controlled the ferment but left the surface unprotected for weeks. Mold-600 without T-SPX means the surface is covered but the fermentation inside was driven by ambient bacteria. For a traditional salami, both stages matter.

 What temperature does T-SPX ferment at?

18–24°C. It's a slow-fermentation culture, not a fast one — so it suits the temperatures you'd typically be working at in winter, which is when most people are running salami anyway.

 Is the white coat from Mold-600 safe to eat?

Yes. The white to light grey surface mould Mold-600 produces is the same type you see on traditional European salami — it's not a contaminant; it's part of the process. If you see green, black, or orange mould on the surface, that's wild contamination, not Mold-600.

 How much meat does each product treat?

One 25g sachet of T-SPX treats up to 100kg of meat. For Mold-600, the 25g sachet makes a 10-litre spray solution — the yield depends on your casing surface area and application method, but the whole solution is used in one batch regardless.