WE TOOK PART IN: H.r.e.n.28 in Slovenia
Our guys have returned from a successful trip to Medvode in Slovenija where they attended H.r.e.n.28 international invitational event organised by our friends at AmuletD20.
This is a short report consisting of their photos and some thoughts about the event.
MARIO: “ I was delighted with the imagination, effort and goodwill of the organizers. I met new and familiar good people, I think that is the best part of such events. Conversations with artistic passion are always inspiring and I will remember them for a long time. The game itself is very fun (I came with very little experience) and with the help of other players I think I picked up a lot. The terrains and scenarios are the stars of the event with their diversity, and the icing on the cake was the Sunday game Dredge28 designed by Vane, which turned out to be very chaotic and fun (I guess I am a "cannon guy", when it comes to ships). “
ANTONI: “ As we waited outside the club entrance, I don't think any of us had any idea what was in store for us: atmospheric music and lighting, floor-to-ceiling fog, and six gorgeous, made-from-scratch tables. The table allocation system itself went much smoother than I expected - each of us was given a map with our own route through the tables (the first of three games is on the Wall of Teeth table, etc.) so there was never any confusion about who we were playing the next game with and where, since competitiveness and winning were not the focus. When I found out that the table scenarios changed from game to game, I was even more thrilled; there were more scenarios than players! No pair of opponents had the same experience, even if they were playing at the same table. Long breaks between games and a constant flow of coffee allowed us to share unique impressions and there was no stress if someone's game dragged on. As for the company, food and drinks, I take my hat off to the entire AmuletD20 team who entertained us, fed us and made the event possible! 10/10 “
SEBASTIAN: "I’ll never forget the moment we all entered the Amulet d20 space on Saturday morning, ready to begin the event. It was an amazing experience when they opened their doors, and the players got to see what the organisers had prepared for us. Atmospheric ligthing illuminating the whole space, omnious soundscapes coming from the speakers and beautiful boards spread throughout - inspiring, well thought-out boards, with lots of variety, specific lore and flavor, and of course all very playable. I played The Big Fucking Cannon board where Luka shot me to pieces at the end of round 3, The Great Wall of Teeth where the Giant Tongue tabled me (with Dorian’s help of course, particularly his Stump Gun) and Greater Ptui where by killing Vitek’s rootling too close to the glorious hole, his virgin sacrifice was accepted and I lost the game in less than 10 minutes. Overall had a blast, and the Dredge Race on Sunday was exactly as we had hoped once Vane finally let us in on the secret game he had created for the event - chaotic, fun, weird, difficult and flavorful. Huge credit to the organisers for pulling together such a great event, and I truly hope I’ll get to attend something as great as this in the future."
For more photos in better resolution, visit our social pages.
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Pigmentation principles: why powdered pigment doesn't work
- • Titanium dioxide (TiO₂) — IR around 2.7 → excellent coverage, strongest white pigment
- • Zinc oxide (ZnO) — IR around 2.0 → good coverage
- • Calcium carbonate (CaCO₃) — IR around 1.59 → poor coverage, filler
- • Calcium sulfate / gypsum (CaSO₄) — IR around 1.52 → almost transparent in a binder, filler
This means that gypsum and chalk, although white as a powder, become almost transparent in the formulation of a coating or mass. They do not compete with the pigment — they are subordinate to it. That's why a small amount of pigment easily and evenly colors a gypsum or chalk-based mass, while the same amount of pigment in a mass containing TiO₂ would be barely visible.
3. Agglomeration — the enemy of even color
Pigment powders do not exist as perfectly separate particles. Due to electrostatic attractive forces and surface tension, the particles spontaneously group into clusters called agglomerates or aggregates. Agglomeration is particularly pronounced in: fine particles (the smaller the particle, the higher the surface area to volume ratio, so the attractive forces are relatively stronger) pigments with a high specific surface area, such as carbon black high temperature or humidity conditions When pigment powder is mixed with filler or binder powder, the agglomerates do not break down—they remain as compact clusters. The visual result is an uneven color: dark spots where pigment particles have accumulated, and pale areas where they are absent. The user then concludes that "more pigment is needed"—but this is not true. The problem is not a lack of pigment, but its poor distribution.
4. Dispersion — meaning properly dispersed pigment
Dispersion is the process of breaking up agglomerates and evenly distributing individual pigment particles throughout a medium (water, oil, binder). A well-dispersed pigment means that the particles are as evenly distributed as possible — each filler or binder particle "sees" the pigment, not just the neighborhood of the agglomerate. Dispersion is achieved by mechanical and chemical means:
- • Mechanical: mixing with high shear forces (mixers, mill aggregates, ultrasound). Mixing with a spoon or spatula is not sufficient to break up agglomerates.
- • Chemical: the use of dispersants and surfactants that adsorb to the surface of the particle and prevent it from re-adhering to neighboring particles.
5. Why liquid colorant works better than powdered pigment
Liquid colorants are not just pigment dissolved in water. They are ready-made systems that contain: Pigment — already dispersed to the level of individual particles or very small clusters Dispersants and surfactants — which keep the particles separated and prevent re-agglomeration Liquid medium — which allows the pigment to be evenly distributed throughout the material being colored before that material begins to set or dry When a liquid colorant is added to the mixing water (e.g. in gypsum, concrete, mortar), the pigment is already in an ideal state of dispersion. The same amount of pigment is evenly delivered to each part of the mixture. The color effect is therefore much more intense than with dry-mixed pigment — with a significantly lower total amount of pigment. The same logic applies to paints and varnishes: pigment pastes and dispersed pigments provide better coverage and color uniformity than pigments that have not undergone the dispersion process.
6. Practical application — gypsum example
Gypsum is a good example because it illustrates all the above principles at once. Because it has a low refractive index (~1.52), it is not a true white pigment — it does not resist staining when mixed with a binder. This means that a small amount of black pigment can easily and evenly color the gypsum mass. Why then does it happen to many people that they have to add a large proportion of pigment in relation to the mass of plaster? Because they mix the pigment in powder form directly into the gypsum powder. Pigment agglomerates (especially Fe₃O₄ or carbon black) remain intact, the distribution is uneven, and the result is disappointing. The conclusion "we need more" is wrong — we need better.
Correct procedure:
Add the colorant (or pigment dispersed in water) to the mixing water Mix the water with the colorant well Only then add the gypsum and mix until a homogeneous mixture This way, the pigment is distributed throughout the entire mass before the gypsum begins to set. The result is an even, intense color with a much smaller amount of pigment than with dry mixing. For those who do not have access to professional colorants, a good alternative are liquid pigment additives available in building paint stores — usually in the form of small bottles intended for tinting wall paints. It is the same principle: the pigment is already dispersed in a liquid medium with additives that prevent agglomeration. Added to the mixing water, they give a more even result than powdered pigment with a significantly smaller amount.
Conclusion
The intensity and uniformity of color in a mass depend not only on the amount of pigment — they depend on how well the pigment is dispersed. A pigment powder mixed with a powder of another material almost always gives worse results than a pigment that has been previously dispersed in a liquid medium, in the presence of dispersants. When you encounter the problem of "the pigment does not color enough," it is worth asking yourself: is the problem not in the way it was added — and not in the amount.
" ["content_hrv"]=> string(9431) "Ovaj tekst nastao je nakon druženja srijedom na kojem se razvila rasprava o pigmentaciji gipsa. Kako nisam uspjela sve objasniti na licu mjesta, odlučila sam to složiti na papir — a principi o kojima je riječ ionako vrijede šire od samog gipsa.
1. Što je pigment — i što nije
Pigment je tvar koja daje boju tako što selektivno apsorbira određene valne duljine vidljivog svjetla i reflektira ostale. Crni pigment apsorbira gotovo sve valne duljine; crveni apsorbira plavu i zelenu, a reflektira crvenu. Važno je razlikovati pigment od punila. Punila su bijele ili neutralne tvari koje se dodaju u boje, premaze i mase kako bi povećala volumen, poboljšala teksturu ili snizila cijenu — ali same po sebi ne daju snažnu boju ni dobru pokrivnost. Tipična punila su kalcijev karbonat (kreda, CaCO₃), kalcijev sulfat (gips, CaSO₄), barijev sulfat i slični materijali. Razlika između pravog pigmenta i punila nije samo u boji — leži u fizikalnom svojstvu koje se zove indeks refrakcije.
2. Indeks refrakcije i pokrivnost
Indeks refrakcije (IR) opisuje koliko se svjetlost lomi i raspršuje kada prolazi kroz neku tvar ili nailazi na njezinu površinu. Što je veći, to čestica jače raspršuje svjetlost — i time djeluje neprozirnije, "pokrivnije". Nekoliko usporednih vrijednosti:
- • Titanijev dioksid (TiO₂) — IR oko 2,7 → izvanredna pokrivnost, najjači bijeli pigment
- • Cinkov oksid (ZnO) — IR oko 2,0 → dobra pokrivnost
- • Kalcijev karbonat (CaCO₃) — IR oko 1,59 → slaba pokrivnost, punilo
- • Kalcijev sulfat / gips (CaSO₄) — IR oko 1,52 → gotovo transparentno u vezivu, punilo
Ovo znači da gips i kreda, premda su bijeli kao prah, u formulaciji premaza ili mase postaju gotovo prozirni. Ne natječu se s pigmentom — podređuju mu se. Zato mala količina pigmenta lako i ravnomjerno oboji masu na bazi gipsa ili krede, dok bi ista količina pigmenta u masi koja sadrži TiO₂ jedva bila vidljiva.
3. Aglomeracija — neprijatelj ravnomjerne boje
Pigmenti u prahu ne postoje kao savršeno odvojene čestice. Zbog elektrostatičkih privlačnih sila i površinske napetosti, čestice se spontano grupiraju u nakupine koje se zovu aglomerati ili agregati. Aglomeracija je posebno izražena kod: sitnih čestica (što je čestica manja, veći je omjer površine i volumena, pa su privlačne sile relativno jače) pigmenata visoke specifične površine, poput carbon blacka (čađe) uvjeta visokih temperatura ili vlage Kada se prah pigmenta umiješa u prah punila ili veziva, aglomerati se ne raspadaju — ostaju kao kompaktne nakupine. Vizualni rezultat je neujednačena boja: tamne mrlje tamo gdje su se nakupile čestice pigmenta, i blijeda područja tamo gdje ih nema. Korisnik tada zaključuje da "treba više pigmenta" — ali to nije točno. Problem nije nedostatak pigmenta, nego njegova loša raspodjela.
4. Disperzija — što znači pravilno dispergiran pigment
Disperzija je proces razbijanja aglomerata i ravnomjernog raspoređivanja pojedinačnih čestica pigmenta kroz medij (vodu, ulje, vezivo). Dobro dispergiran pigment znači da su čestice što ravnomjernije raspoređene — svaka čestica punila ili veziva "vidi" pigment, a ne samo susjedstvo aglomerata. Disperzija se postiže mehaničkim i kemijskim putem:
- • Mehanički: miješanje s visokim smičnim silama (mikseri, mlinski agregati, ultrazuk). Miješanje žlicom ili lopaticom nije dovoljno za razbijanje aglomerata.
- • Kemijski: upotreba dispergirnih sredstava (dispergatora) i surfaktanata koji se adsorbiraju na površinu čestice i sprječavaju njezino ponovno lijepljenje za susjedne čestice.
5. Zašto tekući kolorant radi bolje od pigmenta u prahu
Tekući koloranti nisu samo pigment otopljen u vodi. To su gotovi sustavi koji sadrže: Pigment — već dispergiran do razine pojedinačnih čestica ili vrlo malih klastera Dispergatore i surfaktante — koji drže čestice razdvojenima i sprječavaju ponovnu aglomeraciju Tekući medij — koji omogućuje da se pigment ravnomjerno rasporedi kroz materijal koji se boji još prije nego što taj materijal počne vezati ili sušiti Kada se tekući kolorant doda u vodu za miješanje (npr. kod gipsa, betona, žbuke), pigment je već u idealnom stanju disperzije. Svakom dijelu smjese ravnomjerno se isporučuje ista količina pigmenta. Efekt boje je stoga mnogo intenzivniji nego kod suho miješanog pigmenta — uz znatno manju ukupnu količinu pigmenta. Ista logika vrijedi za boje i lakove: pigmentne paste i disperzirani pigmenti daju bolju pokrivnost i ravnomjernost boje od pigmenata koji nisu prošli proces disperzije.
6. Praktična primjena — primjer gipsa
Gips je zahvalan primjer jer ilustrira sve navedene principe odjednom. Budući da ima nizak indeks refrakcije (~1,52), nije pravi bijeli pigment — u smjesi s vezivom ne pruža otpor bojanju. To znači da mala količina crnog pigmenta može lako i ravnomjerno obojiti gipsanu masu. Zašto se onda mnogima događa da moraju dodati veliki udio pigmenta u odnosu na masu gipsa? Jer pigment miješaju u obliku praha direktno u prah gipsa. Aglomerati pigmenta (posebno Fe₃O₄ ili carbon black) ostaju netaknuti, raspodjela je neujednačena, i rezultat je razočaravajući. Zaključak "treba više" je pogrešan — treba bolje.
Ispravni postupak:
Kolorant (ili pigment dispergiran u vodi) dodati u vodu za miješanje Dobro promiješati vodu s kolorantom Tek tada dodati gips i miješati do homogene smjese Na taj način pigment bude raspoređen kroz cijelu masu još prije nego gips počne vezati. Rezultat je ravnomjerna, intenzivna boja uz višestruko manju količinu pigmenta nego pri suhom miješanju. Za one koji nemaju pristup profesionalnim kolorantima, dobra alternativa su tekući pigmentni dodaci dostupni u trgovinama građevinskih boja — najčešće u obliku malih bočica namijenjenih nijansiranju zidnih boja. Radi se o istom principu: pigment je već dispergiran u tekućem mediju s aditivima koji sprječavaju aglomeraciju. Dodani u vodu za miješanje, daju ravnomjerniji rezultat od pigmenta u prahu uz znatno manju količinu.
Zaključak
Intenzitet i ravnomjernost boje u nekoj masi ne ovise samo o količini pigmenta — ovise o tome koliko je taj pigment dobro dispergiran. Prah pigmenta miješan u prah drugog materijala gotovo uvijek daje lošije rezultate od pigmenta koji je prethodno dispergiran u tekućem mediju, uz prisustvo dispergirnih sredstava. Kada se susretnete s problemom "pigment ne boji dovoljno", vrijedi si postaviti pitanje: nije li problem u načinu na koji je dodan — a ne u količini.
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