Finnish uses the partitive case A LOT. Read this (specifically 2.2.2. With Uncountable Foods), it explains it very well: https://uusikielemme.fi/finnish-grammar/grammatical-cases/the-complement-predikatiivi/
Juice can be blue and people in Finland would do that, even if it wasn't actual juice. Finnish people prefer ease of communication over being technically correct. In Finland people speak about soija-(soy) kookos-(coconut) and kauramaito(oat milk) even though soy, coconut and oat are not mammals nor even animals and thus can't produce milk. Also paino(weight(N)) is often used when people mean massa(mass(kg)). Keskipakoisvoima(centrifugal force) instead of keskipakoisilmiö(centrifugal phenomenon) although keskipakoisvoima is fictitious force. People talk about koronavirus(corona virus) when they refer specifically to either COVID-19 or SARS-CoV-2, clear from context which one is referred to. People use se and ne, when they mean hän or he respectively. People use numero(digit), when they mean luonnollinen luku(natural number), kokonaisluku(integer) or reaaliluku(real number).