A few things across our kits deserve careful thought: the laser, the fungus, and the slime mold. None is exotic — but each deserves an honest explanation. This page covers everything.
Wavelength-specific safety goggles ship with every kit. Worn during every print operation — no exceptions. Standard clear or tinted eyewear offers no protection at this wavelength.
Powerful enough to inhibit fungal growth; far below cutting or engraving lasers. Cannot ignite agar or burn skin on brief contact. Direct beam exposure is hazardous to eyes.
Mucor is the fungus behind traditional fermented foods eaten for centuries. Safe for healthy individuals. Keep culture dishes sealed at all times; wash hands after handling.
Mucor is the same fungus that creates hairy tofu (mao doufu), a beloved traditional food from Anhui Province, China. The fungus is brushed onto fresh tofu and left for 1–2 days at room temperature; the dense white mycelium grows over the surface, creating a distinctive flavour and silky texture. The dish became a global sensation through short-form video, and its profile rose further when Timothée Chalamet visited China and filmed himself tasting it — an unlikely ambassador for a centuries-old fermented food.
In Europe, Mucor also appears in traditional food production. Tomme de Savoie, a traditional French Alpine cheese from the Savoie region, develops its characteristic thick grey rind through Mucor growth during months of cellar ageing — the same mycelium-forming behaviour the kit harnesses for bio-art.
The genus also appears in sufu (fermented tofu) and other East Asian fermented foods, and has a long history of use in food cultures across multiple continents. Under standard biosafety classification, Mucor is not considered a human pathogen for healthy individuals. As with any biological material, people with compromised immune systems should consult a physician before use — see the infection risk section below.
For healthy individuals the risk is negligible. Mucor spores are naturally present in soil, compost, and decaying organic matter worldwide — we already encounter them in ordinary environments without issue.
Mucor species can, in rare circumstances, cause mucormycosis — a serious but rare fungal infection. This occurs almost exclusively in people with severely compromised immune systems:
Mucormycosis does not occur through food consumption or routine handling by healthy people.
Risk notice: If you or anyone regularly in your workspace is currently immunocompromised (conditions listed above), consult a physician before use. For all other users, standard hygiene is sufficient: wash hands after handling cultures, don't touch your eyes or mouth during experiments.
Two reasons. First, the sealed environment prevents contamination — Mucor competes with other airborne fungi, and an open plate can be overrun before your print completes. Second, keeping the dish sealed minimises spore dispersal as a precautionary measure. The laser operates through the transparent lid; the seal is never broken during normal use.
When you are finished with a culture (after the experiment is complete), dispose of the sealed plate in a standard household bin or compost. Do not open spent cultures indoors.
Fungal allergies vary widely in their triggers. If you have a diagnosed fungal allergy — particularly one triggered by Mucor or related genera (Rhizopus, Absidia) — consult an allergist before use. The sealed culture format minimises airborne spore exposure during normal operation. People with mild general environmental fungal sensitivities typically have no reaction, but we cannot make guarantees for individual allergy profiles.
Used in the Slime Dyeing Kit and our slime-mold dyeing workshop. Despite the name, it is not a fungus — and it is one of the safest living organisms you can keep in a classroom.
No on both counts. Physarum polycephalum — the bright-yellow "blob" made famous by maze-solving experiments and the Paris Zoo's "Le Blob" — is a slime mold, a single-celled organism in the kingdom Amoebozoa. Despite the word "mold" in its common name, it is not a fungus and not a mold: it doesn't form the airborne spore clouds people associate with household mold.
It is non-pathogenic and non-toxic. There is no known human or animal disease caused by Physarum, which is exactly why it is one of the most widely used live organisms in school and university biology labs worldwide.
No. Physarum polycephalum cannot infect humans or animals. It has no mechanism to colonise living tissue — it feeds on bacteria and oat flakes and thrives only in cool, damp conditions on its culture dish. It is found naturally on forest floors, decaying logs, and leaf litter, and people encounter it outdoors without any risk.
It is not a food, though. Like any lab organism, it should not be eaten, and you should wash your hands after handling it.
Yes — Physarum is a classic classroom organism recommended for ages 10 and up. It requires no special containment, no fume hood, and no protective equipment. The only rules are ordinary hygiene: keep the dish covered, don't eat it, and wash hands after handling. Younger children can take part with adult supervision.
Because it is slow-moving, non-motile in the everyday sense, and needs no heat, chemicals, or electricity to keep, it is far lower-risk than most hands-on science activities.
Handling: keep the culture dish covered except when adding oats or dye. Wash hands afterward and avoid touching your eyes or mouth — the same habit you'd use with any culture.
Storing / pausing: if you need a break, let the plasmodium dry into a sclerotium (a hardened, dormant crust). It stays viable for weeks to months and revives when you add moisture and food — no refrigeration or chemicals required.
Disposal: the slime mold, agar, and oats are fully biodegradable. Seal a finished dish in a bag and place it in household compost or general trash. No biohazard disposal is needed.
The Slime Dyeing Kit uses non-toxic, food-grade colorants introduced through the slime mold's food, so the organism carries the pigment as it grows. They are safe to handle with normal hygiene. As with any craft colorant, avoid ingestion and wash hands after use; some pigments can temporarily stain skin or surfaces, so working on a wipeable surface is recommended.
The kit uses a low-power violet laser module. Under IEC 60825-1 — the international laser product safety standard — this is a Class 3B laser.
For context: desktop laser engravers and cutters commonly sold online are hundreds to thousands of times more powerful. This module is closer in power to a strong laser pointer — the eye hazard is real but fully manageable with the included goggles and a closed enclosure.
Mucor is highly photophobic at short visible wavelengths, and violet light sits at the peak of its photoinhibition response. This means very low power is enough to create a sharp, reliable growth boundary. Longer visible wavelengths — red or green — would require significantly more power to achieve the same biological effect, making violet both the most effective and the lowest-power option.
No. Regular sunglasses, safety glasses, or tinted lenses offer no meaningful protection at this wavelength.
Violet light sits at the boundary of visible and near-UV light. The eye's natural aversion reflex — the blink triggered by intense bright light — is less reliable here because the brain does not perceive violet light as obviously bright the way it does green or white light. This means you are more likely to sustain an unnoticed overexposure than with a comparably-powered green laser.
The kit includes OD 3+ goggles rated for 400–410 nm, which reduce transmitted energy at this wavelength by a factor of 1,000×. These must be worn during every print. They are also rated for general eye protection and comfortable for extended wear.
Enclosure walls: the printer chamber is designed with matte internal surfaces. Diffuse reflections from matte materials at this power are not hazardous.
Skin: a brief, moving-beam exposure will not cause a burn. Prolonged static exposure to bare skin is not recommended but is not a significant hazard at this power level.
Reflective surfaces (metal, mirrors, polished plastic): avoid introducing these into the print area. A specular reflection from a mirror-like surface can redirect a concentrated beam toward the eye — this is the scenario the goggles are designed to protect against.
The kit is rated 13+ with adult supervision recommended for first use and laser setup. A curious, responsible teenager can operate the kit safely with the included goggles and a closed enclosure. The laser does not operate unless the printer is actively running a job — it is not a free-moving pointer.
We recommend that adults supervise any session where younger users are calibrating or adjusting the laser module, and that the goggles rule is enforced without exception.
Yes. Every time a user initiates a print job, the funguy control software displays a mandatory confirmation prompt requiring acknowledgement that goggles are on before the laser is allowed to activate. The laser cannot be turned on without dismissing this prompt. This check runs at the start of every session — not just the first use.
Goggles included
Class 3B · enclosed
Edible fungus species
Ages 10+ (slime) · 13+ (printer)