Schramm said that because of its tendency to readily exhibit oxidative sap stain
and to host various fungi, hackberry has fallen from favor over the last few decades and is often relegated for use om covered furniture or pallet stock.
Recorded drying defects included percent sap stain
, total length affected by check and split, numbers of sticker marks, and percent mineral stain.
Blue stain, or sap stain
, is a phenomenon caused by pigmented micro-fungi growing primarily in the parenchymatous tissue of sapwood where starch and sugars are available.
It can be subject to blue sap stain
. Hackberry takes a finish well and can be finished in its natural color.
Wolfe said that the company's yield determination may differ from the figure on the invoice "because we (deduct) things that they might not consider a defect, such as sap stain
. We find that the customer is willing to pay a higher price for this kind of quality."
* Three initial stains are applied: a sap stain
, body stain and penetrating stain.
It also has a tendency to blue sap stain
. Its heartwood is resistant to preservative treatment.
The wood is very susceptible to fungi attack, including the blue sap stain
With regards to seasoning, the wood dries well and rapidly, although users should watch for sap stain
when air drying.
If you're hauling the tree in the back of your SUV or minivan, lay down a blanket or tarp to protect your interior from sap stains
Paraffin oil will remove most sap stains
. Every few weeks apply a few drops of light oil to moving parts such as springs, pulleys and bolts.
The material can stain blue because of sap stains
. It usually features a plain look, but the interlocked grain can yield a ribbon stripe.