Board Thread:Suggestions forum/@comment-26322120-20160709030904/@comment-26127220-20160710132022

Water can be recoloured because Mojang made it biome related. This does not exist for lava and would mean that Mevans would need to make his very own lava, which is a lot of unnecessary work. And not only 1, water shares a colour pattern I believe, like grass. But if you want bright red, transparent and Green all at once, that means Mevans needs to code 3 seperate lava "blocks" for the same effect vanilla lava supplies. That is a lot of extra work for something minor.

Next to that, Water can, in real life, be different colours depending where in the world you are, lava/magma doesn't change colours or form. Maybe it can have more filth in it and it would be a bit more black than at other times, or when it's starting to solidify. But having bright green lava or transparent lava is impossible and frankly has no logic to it because of the work of elves, magic or anything for that matter.

To be honest, if you really want a different colour and sound for lava, get a resource pack that replaces just that, or make it yourself. It isn't that hard and there are plenty of tutorials for it. But it is too much work for absolutely no reason but taste.