Personalized Funny Chemistry Science Joke You're a 10 pH Scale T-Shirt Baby Bib. You're a 10 on the pH scale, and that's the highest compliment you can get! This funny chemistry joke is perfect for anyone who loves pH puns and chemistry humor. Whether you're a chemistry teacher, a student, or just someone who loves to crack science jokes, this design will definitely make you and your friends laugh. Our Baby Bib is rated high in convenience and durability and with a variety of fashionable colors, your baby can be trendy. Mix and match to any outfit. 100% cotton ring spun combed heather colors are cotton-poly. Width 7.75", Length 11.75"