I noticed that someone on another forum suggested that this might be water deposits. This should be easy to find out by putting a drop of straight vinegar on a section of it, (or removing a bit of it first for this purpose.) Although a stronger acid is usually used for this test, such as 10% HCL, it will work with vinegar, too. You just have to look closely.
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Patty
Pahsimeroi, Idaho

D. auratus blue, auratus Ancon Hill, galactonotus orange, galactonotus yellow, fantasticus, reticulatus, imitator, castaneoticus, azureus, pumilio Bastimentos. P. lugubris, vittatus, terribilis mint green, terribilis orange.