This section is from the book "Facts Worth Knowing", by Robert Kemp Philip. Also available from Amazon: Inquire Within for Anything You Want to Know.
If flowers of sulphur be mixed in a little of milk, and after standing an hour or two, the milk (without disturbing the sulphur) be rubbed into the skin it will keep it soft, and make the complexion clear. It is to be used before washing. A lady of our acquaintance, being exceedingly anxious about her complexion, adopted the above suggestion. In about a fortnight she wrote to us to say that the mixture became so disagreeable after it had been made a few days, that she could not use it. We should have wondered if she could - the milk became putrid! A little of the mixture should have been prepared over night with evening milk, and used the next morning, but not afterwards. About a wineglassful made for each occasion would suffice.
 
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