I am wondering what happened in the fortepiano's history that made the keyboard colors switch (why black keys on some ancient pianofortes are now white on modern pianos). 

Here is a picture of a baroque fortepiano with such a keyboard.

[![Baroque pianoforte (taken from http://hubpages.com/entertainment/Piano-in-the-Baroque-Period)][1]][1]

Did all pianofortes have this color pattern before?


  [1]: https://i.sstatic.net/XIfEm.jpg