Hearts change colors in different circumstances

Here is what i think.

When you are in water your hearts should slowly change to a bluish-red color

In Lava or fire, more of an orange color

On ice? A sky blue color.

In a cave? A slightly darker red.

The change back to normal should be gradual, like when it starts changing. Also, having water breathing in water keeps your hearts red, as for having fire resistance in lava, frost walker on ice and night vision in caves. Id love to hear what you think!