[Histonet] Bottomless cup of coffee

[Marshall Terry Dr, Consultant Histopathologist]

 I first came across this concept in Ottawa in 1962 - a cup of coffee
that was replenished at no extra charge.
In Oman in 1989, I came across the Indian vegetarian thali that was
constantly replenished. (Pearl restaurant in Ruwi - highly recommended).
Now I have come across the bottomless pot of haematoxylin, which has
been in use in this lab since I came 8 years ago.
Apparently it is just topped up now and then, and rarely discarded for
fresh haematoxylin.
Is this normal/standard/acceptable.
I am shocked to the core!

Terry