Antique furniture restoration .Can anyone advise on the filling of grain.The modern grain fillers discolour?

I find the grain filling process of french polishing very slow and would value any advice on how to speed up the process without affecting the colour of the wood

Answers:
put a small amount of Laqure Retarder on a rag and rub- works miracles. go to Shirwin Williams for the product.

Other answers:
Mmnn tricky. Have you spoken to any antique furniture restorers?
Mmnn tricky. Have you spoken to any antique furniture restorers?
sand the very bottom where u cant see, mix sanding powder with pva glue and hey presto,a miracle has been achieved,
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