Printed colors do not keep standing requirements

I have my son (12 months) at Christmas the building blocks Ene, mene, Zoo gift, because I find toys from Haba very nice and it was up to now always well made.
The building blocks have very beautiful colors and cute, but it dissolves the printed ink if my son around gnaws it (what children in the age just do) as the ears of the Monkey are already scraped away and the colors of the blocks themselves hold the Unfortunately gnawing not quite stand in some places. Even if the color as described on the website of Haba harmless to children, the building blocks are not worth the price. Have the building blocks, but then rated 3 stars because the colors are really beautiful (and toxic) and fun for my son to play with.