Pristine foam layers do not exist. They are usually lightly discoloured and / or have micro tears, due to the fragile nature of the foam / latex and it's handling during the manufacturing process.Some natural discolouration of the foam is also due to oxidation that causes a change in color, when exposed to air and light. Rest assured that discolouration and micro tears are normal and will not interfere with the comfort of your product, and its warranty in any way. If you would have bought a foam mattress that had a non-removable cover (like most stores sell) the foam inside the mattress would have been discoloured and had micro tears in it. This is the nature of foam business and most customers are not aware of this, since they never handle raw foam without its cover. All the foam we use is "new" and rated sanitary for personal use.