RE-GROUTING TILES

[Frances Smith]

We are decorating our Bathroom and decided to try to "freshen
up" the grouting between the wall tiles, by scraping the old grout out and
then re-grouting. This was more for an improved appearance than anything else.

The original grouting was scraped off but when re-grouted, although the grout at first appeared to be OK, when it dried and the tiles were washed over to remove the excess grout from the surface of the tiles, the new grouting turned mostly black and was easily removed by washing with a damp cloth. I wondered if we should have left it for longer for the grout to thoroughly dry out (?) - but was told no.

It seems, however, that there is insufficient space between these tiles to
allow the new grouting to "catch and stick" - although the original
grouting has stood the test of time for some 15 years or so. I'm confused.
Any advice you can offer would be helpful.

Cheers