Can anyone help identify this book?

[OhWotIsItThisTime]

It’s children’s fiction. There’s a magic chemistry set and the kids can fly and it all goes a bit wrong when one goes invisible.

I loved it and want to buy it for me my kids, but can’t for the life of me remember what it’s called.

Google’s no help, as it keeps bringing up The Ogre Downstairs, but it’s not that. Please help!

Sorry; I missed the requests for websites!

Canny cat has given you the good websites, but I just wanted to add in Google book search.

The others are all paid databases, but Waterstones etc will have subscriptions so if you go in at a time when they aren't really busy, they will usually be more than happy to search for you.

Thank you both @cannycat20 and @naomiNagata I did check abebooks and searched a few sketchy keywords and it actually found the book I was looking for!

Managed to order a copy of ebay for a few pound and am really looking forward to reliving this one, thank you both!