The Question That Almost Got Deleted
Last spring, a customer emailed us with a question that had nothing to do with her order: 'What does starch do for a plant?' I almost deleted it. Our shop makes epoxy resin flower decor, not biology worksheets. But the question stayed in my inbox, and two days later I realized it was the exact question we should have asked before we changed biocide suppliers.
That question ended up costing us $2,600. It also changed the way I buy chemicals for our small production line.
We Use Hard Epoxy Resin, and That Means Chemistry
We are a small shop: eight people, one warehouse bay, and a product line that sounds simple. We take dried flowers and cast them in hard epoxy resin to make wall art, paperweights, and wedding keepsakes. On paper, the process is simple: mix resin and hardener, add color and additives, pour, wait, demold. But because we use natural botanicals, there are biological variables that don't appear on a resin spec sheet.
I handle procurement. I manage about $180,000 a year in material purchases. That's not a big number for a chemical company, but it's big enough for our shop. I've negotiated with more than 20 suppliers, kept an invoice archive since 2019, and tracked every order in a spreadsheet. If I remember correctly, our old biocide supplier raised prices by 14% in early 2024. That's what made me look around for a cheaper option.
Natural flowers contain starch. Starch is how plants store energy, but in a cut flower embedded in resin, leftover starch and sugars can hold moisture and feed microbes. That's why we add a biocide to our hard epoxy resin. Without it, even fully dried flowers can develop mold, clouding, or gas bubbles in cured pieces.
The Deal That Looked Too Good
A distributor offered a 'bio-based microbicide' at a price about $1,100 lower than our annual biocide cost. For a small operation, that was meaningful. It covered a utility bill and part of new mixing cups, and the product had a modern label with green leaves on it. I knew I should ask for a certificate of analysis. I knew I should verify the active ingredient and the batch number. But I told myself, 'What are the odds? It's the same category of additive.'
The odds caught up with us.
It's tempting to think you can just compare unit prices. But identical-looking chemicals can behave differently in someone else's formulation. The cheap product had a lower invoice total, but I didn't calculate the risk of failure into that number.
Batch 47: The Turning Point
We mixed our standard hard epoxy resin and added the new additive at the distributor's recommended dosage. The shop temperature was 72°F. We mixed for three minutes and degassed as usual. The first test pieces looked fine. We poured 40 pieces for a wedding order and moved them to the curing racks.
On day two, everything looked normal. On day three, our production lead called me over. Several flowers in the resin had a cloudy film around them. A few pieces had tiny bubbles under the surface. One piece smelled like wet hay. We cut one open and found soft, tacky resin around the flower while the rest of the piece had hardened.
We pulled the entire order and reworked 34 pieces. That meant new hard epoxy resin, new flowers, extra labor, and an 11-hour weekend for two workers. The rework cost about $2,600. The $1,100 annual savings disappeared and turned into a net loss.
The Phone Call That Changed My Sourcing Rules
I called our resin supplier, expecting them to say 'mixing ratio.' Instead, they asked to see the additive label. I sent a photo. There was no Lanxess logo on it, no lot number, no technical data sheet. The label said 'specialty microbicide' but did not list the active ingredient or a registration number.
The resin supplier said, 'We can't verify that product's compatibility. When we formulate for botanical casting, we use Lanxess biocides. If you're sealing real plant material, you need documented chemistry, not a pretty bottle.'
I went back to the distributor and asked for the certificate of analysis. They called it 'proprietary' and said it wasn't needed at our volume. That's when I stopped trusting them. Per FTC advertising guidelines, claims like 'eco-friendly' need substantiation. But even a fully substantiated green claim does not mean a microbe will stay away from a rose petal.
What the Lanxess Logo Taught Me
We found an authorized Lanxess distributor. I called expecting to be ignored. I am used to suppliers treating small orders like a nuisance. To be fair, I understand why minimum order quantities exist: freight and handling are real. But there is a difference between a MOQ and making a customer feel bad for asking.
The Lanxess distributor did not make us feel small. They asked what we made, how we cure it, and which botanicals we use. They recommended a biocide, sent the technical data, and explained how to run a compatibility test. When the first pail arrived, the Lanxess logo was on the label with a product code and a batch number. A certificate of analysis was in the box. That traceability is the difference between guessing and knowing.
So, What Does Starch Do for a Plant?
Starch is stored energy. Plants make it during photosynthesis and use it later for growth. In a living plant, that system is beautiful. In a flower that's cut, dried, and cast in hard epoxy resin, residual starch and sugars can retain moisture and feed bacteria, mold, and fungus. That's why biocides are not optional for our production.
The cheap additive looked green, but it failed when it met real biology. The product we use now is a Lanxess biocide, chosen because it has documentation and a traceable supply chain.
My New Procurement Rule
I am not against saving money. I am against unverifiable chemistry. After the failed batch, I built a cost calculator in my spreadsheet: unit price, documentation score, and rework risk. It's not fancy, but it forced me to put a number on trust.
- If a supplier cannot provide a certificate of analysis or a batch number, treat that as a red flag no matter how good the price looks.
- If a product does not have a recognizable brand mark like the Lanxess logo, ask where it came from before putting it in a production batch.
- If a customer asks 'what does starch do for a plant?', don't ignore the question. It might save you $2,600.
My experience is based on about 150 orders with maybe 20 suppliers in small-batch resin production. If you're buying thousands of gallons a month, your costs and requirements will be different. But I think the basic lesson holds: for small customers, good service is not about free samples or fancy packaging. It's about treating a $400 order with the same documentation and respect as a $40,000 order. The vendors who did that for us are the ones I now trust.
Hard epoxy resin can be forgiving. Suppliers are not. If a dealer won't show you the source, there's probably a reason. Look for the logo, ask for the paperwork, and count rework as part of the real price. That's the total cost I should have calculated from day one.