there is no link to this but the picture and caption made it easy to follow!
start with a pan of baking soda (i used the box from my fridge because it needed to be replaced.) mix some food coloring with vinegar and let your child use a dropper to transfer the vinegar onto the baking soda. i had a dropper left over from a medication but you may be able to get one from your pharmacy for free. the good thing about a dropper is that it takes more time for your child to do the activity! i wish the dropper had been smaller.
i would use a bigger pan next time because she covered the surface in about 5 minutes. she loved seeing it fizz! isn’t this a face of sweet surprise?!