2 clear cups
food coloring (I found green & blue worked best with the bleach we had)
To start, add a small amount of water in 1 clear cup (I filled mine about 1/4 of the way). In the other cup, fill almost to the top with bleach, leaving room for mixing the water & bleach together. (I filled mine about 3/4 full of bleach).
Talk to your kids about how when we are born, our hearts are clean & clear like the water. But as we get older we sometimes make bad decisions (we call them sad face choices). We may hit a friend or family member, we may tell a lie, we may say something really mean, etc. (talk about some of the bad choices they may have made, let them voice some as well).
With each bad choice you talk about, add a drop of food coloring. We alternated between green and blue.
Then talk about how the Bible says that the wages of sin is death, which means that if we do something bad, we are supposed to die for that choice. But when Jesus died on the cross, He made a way for us to wash away that bad choice. (It's important to remind them that their actions still have consequences but we are forgiven).
Now, the only way we can have those sins or bad choices washed away (cause we can't separate the dirty water from the clean anymore) is to invite Jesus into our hearts. We tell Him we are sorry and ask Him to forgive us.
As you talk about forgiveness, pour the bleach into the "dirty" water and pour back & forth between the cups to mix up the solution. You will begin to see that the color will disappear.
Talk about how just like the color disappeared, Jesus washes away all of the yucky dirty bad things in our hearts when we ask Him to forgive us. When we ask, He ALWAYS forgives us.
Let me know if you have any questions and if you do this experiment, let me know how it turned out. What colors did you use?