An indoor rink I skate at has white ice. It is very hard to see blade tracings, a nuisance.
Why?
In another thread, someone said a layer white paint is often used under the hockey markings, to make them stand out - but in this case the top of the ice is white, which makes it hard to see the hockey markings through it.
The ice was pretty smooth, so it wasn't snow from prior skaters. The ice at that rink is sometimes rough because they have no dehumidifier (they economize a lot on maintenance), but it wasn't very humid.
So is there something about the way the ice is surfaced, or the water is purified (or not) that could make the top white? Something else?
(My usual rink, which has wonderful ice, is closed for the season. This white rink is close by, so a lot of us have moved there.)