The Dan&Darci Create Your Own Soap & Bath Bombs Science Lab stands out as a superior DIY kit compared to the others we tested. While many DIY bath bomb kits are challenging to use and give disappointing results, this kit manages to make the process both enjoyable and educational without causing a messy situation. Priced at around $1.50 per bath bomb, soap, or scrub created, it is also the most cost-effective option among the kits we reviewed. Suitable for children aged 6 and above, regardless of their crafting skills, this kit is virtually foolproof, although adult supervision is necessary.