When did the 'D' and baulk line on a match snooker table become white?

Question

The lines used to be black.

Answer 1

Both answers are right -The TV  and I saw a few in the 50s just not that many-Most are still black

Answer 2

in the 1950's

Answer 3

I've just had a table recovered and the lines are still black (pencil actually, i saw the bloke do it).

Do you mean on the telly?

It is so the viewers can see the baulk line and D better.

Can't tell exactly when this changed, but recently.