Help me understand the difference between "white cast" and "tone up" in sunscreens 🙏

Tone ups are specifically made to provide a tint (usually pink, peach, beige or even lilac) that evens out and brightens the skintone. They look and blend better on the skin. Whereas whitecast seems to just sit on the skin and can be hard to blend. They also look harsher due to the white base as opposed to the soft coloured tints in tone up spfs Tone up can translate to whitecast on a lot of people because it's just too light on most skintones 😅 The whitening effect is too obvious. Those who aren't familiar with the term will say it's whitecast. Tone up is intentionally thought out when creating the formula but whitecast isn't, it's like a flaw, an unintended side effect basically

As far as my experience with using several sunscreen products and tone ups on my tan skin, usually if the product has a white cast, my skin color will look grayish, but tone up is not so, the tone up product only raises the skin tone slightly so it doesn't look gray, it looks bright and fresh.

'Tone up' effect varies according to people preferences. For me, I like sunscreen that has 'tone up' effect that can even up my skintone. I relate tone up with tone correcting. Usually I prefer one that has some pink undertone, since I like how it gives the 'liveliness' feel to my face🤣 White cast on the other hand, makes your skin appears to be covered with a white film. So, the skin you apply sunscreen with whitecast will seemingly to be 'whiter' that your original skin tone. It does nothing to tone correcting. Luckily for me, I have a fair skintone, so I generally don't mind any whitecast.

There’s always a white cast when you use spf with zinc oxide.

here for the answers… have been looking for clarity in tone ups too