What's The Reaction Between White Spirit and Detergent?

What's the reaction between White Spirit and Detergent? www.go-repairs.blogspot.co.uk/...
I was cleaning some brushes with white spirit and detergent when I noticed this weird reaction.
Have any of you seen it before or know what is happening?
The brand of detergent was Fairy clean & fresh citrus grove if this helps.
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What is the reaction between white spirit and detergent
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